For me, two things help:
1) Recognizing what is going on. Seriously. Once I recognize it and realize it's PMS, that takes a lot of it away, and I feel like a different person.
2) Premsyn. When I start feeling crazy and like the walls are closing in, and I realize what time of the month it is, I'll take a couple. Rarely more than once or twice. Usually I don't need to, if I pay attention to #1, above. I don't know how this would react with your bipolar meds - you'd want to check first.

Definitely, definitely talk to your doctor.