Terrible mood swing after period?

I'm usually stable, the week prior or the week of my period is an emotional boost and I feel great, I feel super happy. But the week after or two weeks after my period suddenly comes this terrible mood swing when I feel really bad, I cry a lot even tho I try to control myself, feel bad, feel heartbroken, start getting really bad thoughts, this lasts a week/week and a half only, and I thought I could simply deal with this, but this affects me when I'm studying. The feeling is so bad I've self harmed due to desperation. Does this eventually goes away? Is there a way to make this time less terrible without medication? Does this happens to someone else here?
Terrible mood swing after period?
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