Those feelings are no fun and I'm sorry you are struggling with them! I have severe PMS too, was diagnosed with Premenstrual Dysphoric Disorder. I ended up going on Prozac and very slightly raising the dosage during the worst part of my cycle, then lowering it back down again once my cycle started anew. This was at the instruction of my pdoc of course. Not sure if you are an SSRI and can discuss this with your physician.

Good luck with it. You know all the standard stuff they tell us: eat nutritious whole foods, try to get enough sleep and some exercise.