I have this. I would regularly get suicidal the week before my period (I didn't realize there was a pattern to it until much later, I just thought it was regular depression). I started realizing when I'd get my period, the week before would have been entire hell. But when I finally got it, I'd go back to normal mentally. I'd even look forward to my period because I knew when I got my period the mood issues would stop. It was just the week before my period that was hell. Suicidal thoughts, a horrible outlook on life, being reminded of past traumas. It's strange that mother nature makes women go through that specifically the week before our period. Still don't know the evolutionary reason for it. But I was reading it happens because of a drop in progesterone or something the week before our period, similar to drug withdrawal.

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Anyway, I was diagnosed by ignorant doctors as having 'severe depression' and had to take Zoloft everyday, which basically over-medicated me the days I wasn't PMSing. Felt like a robot. Now that I realize my 'severe depression' is a once a month thing, I'm taking steps to deal with it once a month. I write on my calendar when my PMS days are going to be so I can be prepared. I also try to get proper sleep, less sugar, and eat more because I find if I don't follow those things my PMDD is worse. Sunlight is probably the number one cure-all for me. I'm severely vitamin D deficient so sunlight helped me get my vitamin D levels up and it helped a tonnnn. More than any medication actually. But this year I definitely slacked on sunbathing and felt the effects.

Therapy helped me a lot, but I can't really afford it right now. Journaling and positive social interaction helps a lot too.