Tuesday, about nine o'clock
He's on the couch looking at his phone. You're standing in the kitchen doorway holding two mugs of tea, and you're completely sure he doesn't love you anymore.
It doesn't feel like a worry. It feels like a fact. While the tea goes cold, you go over the evidence. He didn't ask about what you told him on Sunday. He said "sure" in that flat voice. He's been on his phone since eight. None of it is a big deal on its own, but together it all seems to add up.
By Thursday you're even more on edge. He loads the dishwasher wrong, and you snap at him much harder than a dishwasher deserves. Your voice comes out higher than you meant it to, and for a second it's like you're watching yourself from the outside and can't stop.
He goes quiet, which somehow makes it worse.
On Saturday your period starts. By Sunday afternoon the whole thing has lifted, and when you think back to Tuesday, it's like reading someone else's diary.
You've noticed this pattern before. Every time, you've explained it away. It really was a bad week. He really was being distant. You're just less patient right now, and anyone would be. That explanation has worked for years because it's partly true, which is why it's so hard to let go of.
The volume isn't yours
"Is it that time of the month?" is an insulting thing to say, and you've probably heard it in a tone that made you want to throw something.
Your feelings are real. He may really have been distant on Tuesday, and you aren't imagining problems in your marriage.
What's different is how big the feelings get, how certain you are, and how quickly it all fades once your period starts. A chemical change is turning up the volume, and you've been arguing with the music instead of the dial.
That chemical change also isn't who you are. Your personality is yours, but a pattern like this can be treated.
The calming chemical nobody mentioned
After you ovulate, in the second half of your cycle, your ovaries make progesterone. Your body turns some of it into a calming chemical called allopregnanolone. You can think of it as a natural sedative. It works on GABA, the brain's main system for calming down, which is the same system alcohol and anti-anxiety medicines affect.
Allopregnanolone rises during the second half of your cycle and then drops sharply in the last few days before your period.
In premenstrual dysphoric disorder, or PMDD, which is a severe form of what people often brush off as PMS, hormone levels are usually normal. The difference is how sensitive the brain is to the change. The same rise and fall that another woman barely notices hits some women much harder.
If you've ever had blood work done and been told everything was fine, this is why. Your hormone levels were never the problem, so there was nothing for the test to find. The problem is how your brain reacts when they change.
PMDD affects roughly 2 to 5 percent of women, depending on how it's measured. About another one in ten women has a mood problem tied to her cycle that's serious enough to need treatment but doesn't meet every criterion for PMDD. That second group rarely gets talked about, and it's a big group.
PCOS makes things harder. Women with PCOS have more than double the odds of depression and anxiety, which is why the 2023 international guideline says every woman with PCOS should be screened for both. Higher androgen levels (hormones like testosterone) are linked to higher depression scores, although that link gets weaker once age and weight are taken into account. And the blood sugar swings I wrote about in my post on crashes and cravings can cause irritability of their own on top of all this.
There's one complication. If you don't ovulate regularly, you may not have a clear second half of your cycle, which makes the pattern harder to spot and harder to prove. There also hasn't been much research on premenstrual mood swings in women with PCOS specifically. That's a gap in the research, not a gap in you.
The people around you
Partners of women whose moods change with their cycle tend to describe the same things. They don't know which version of her they'll find in the kitchen. They watch what they say, and they go quiet so they don't set anything off. Some stop bringing things up at all.
So the distance you were so sure about on Tuesday may be partly real, and partly caused by the pattern itself, because he's learned that some weeks it's safer to say less.
You're not a bad person. And you can't fix this by apologizing more or trying harder, even though that's what people will tell you to do. You can't discipline your way out of a chemical change. Things get better when the cause is treated.
What to do next
Start tracking your moods today, before you see a doctor. Don't rely on memory, because memory is exactly what gets unreliable here. That's why a PMDD diagnosis officially requires daily ratings over two cycles. Each day, rate your mood from one to five and mark the first day of your period. After two months you'll have a chart instead of a vague feeling that something's wrong, and a chart is hard for a doctor to dismiss.
Ask your doctor to check other possible causes too, like thyroid problems, poor sleep, depression or anxiety that isn't tied to your cycle, and any medications you take, including hormonal birth control.
For PMDD, doctors usually try SSRIs first. These are a type of antidepressant, and they work unusually well for PMDD. About 60 to 70 percent of women respond, compared with about 30 percent on a placebo. They also start working within days rather than weeks, so some women take them only during the second half of their cycle. Most women have never been told that's an option.
Metformin is worth asking about to treat the PCOS underneath, though we don't know much about how it affects mood. A small study found that depression and anxiety scores dropped after three months, and metformin plus lifestyle changes worked better than lifestyle changes alone on a depression score. But another randomized study found no effect after six months. So think of it as a treatment for insulin resistance rather than a mood medication. It's prescribed off-label for PCOS, which means it's approved for something else but can legally be used for this, and that's common and backed by guidelines. It can upset your stomach at first, though the extended-release version is gentler, and your B12 should be checked if you take it long term.
I'd be more careful about GLP-1 medications here than in my other posts. The research on how they affect mental health is mixed, and some large studies have found higher rates of anxiety and depression in people taking them. They aren't a treatment for this. If you already take one and your mood has gotten worse, tell your doctor instead of blaming yourself.
You could bring this to your appointment:
My mood changes seem to follow my cycle. I've tracked it for two months, and here's the chart. I'd like to talk about PMDD and whether my PCOS might be making it worse.
Bringing the chart
Start with your primary care doctor, your OB-GYN or an endocrinologist (a hormone specialist). Bring your chart, and use the word PMDD, because naming it changes what they'll consider.
Go in knowing this gets missed a lot. PCOS affects about one in ten women and is still often treated with a birth control prescription and nothing else, and mood swings tied to the cycle often get blamed on stress or personality instead of being looked into. If your appointment goes that way, it tells you more about that doctor's training than about you. You can ask again, or see someone else.
For care focused on PCOS, Allara Health is an online practice for PCOS and women's hormone and metabolic health. It pairs doctors with dietitians and takes many major insurance plans, though it isn't available in every state. Sesame lets you book a specific doctor at a set price without insurance or a referral, which can help if you're uninsured or facing a long wait.
I have no financial relationship with either company. I'm not an affiliate, and I don't get paid if you book. I mention them because telling you to find a doctor who understands PCOS isn't much help without somewhere to start.
PCOS doesn't go away, and nobody can promise these weeks will disappear completely. But a problem that comes and goes on a schedule is one of the easier kinds to treat, and plenty of women have seen their Tuesdays get better. You didn't just become a difficult person in your thirties. You've been dealing with something nobody measured, and two months of tracking is a good place to start.
This is my experience and my reading of the research, not medical advice. Nothing here should replace a conversation with a clinician who knows your history.
Sources
- Role of allopregnanolone-mediated GABA-A receptor sensitivity in the pathogenesis of premenstrual dysphoric disorder — Journal of Zhejiang University Science B, 2023
- Premenstrual Disorders — StatPearls, NIH National Library of Medicine
- Mental Health Across the Menstrual Cycle in Polycystic Ovary Syndrome: Insights and Implications — Phimphasone-Brady et al., Current Psychiatry Reports, 2024
- Toward the Reliable Diagnosis of DSM-5 Premenstrual Dysphoric Disorder: The Carolina Premenstrual Assessment Scoring System — Eisenlohr-Moul et al., American Journal of Psychiatry, 2017
- Expert Guidelines for the Treatment of PMDD — MGH Center for Women's Mental Health
- Recommendations from the 2023 International Evidence-based Guideline for the Assessment and Management of PCOS — Teede et al., Journal of Clinical Endocrinology and Metabolism, 2023