I agree now is a time when you need help. Your school probably has some type of help for students? I'm guessing you are having a hard time because bipolar is cyclical (yearly really,) and you're not only going into your bad time of year but also you had a big change when you moved in with your boyfriend. Big sudden change is hard for people with bipolar sometimes.

-first off, you need to see a psychiatrist and get on meds if you can
-secondly you need to get in to see a therapist
-thirdly, you need to do this even if your boyfriend doesn't understand why, you need to help yourself
-fourthly I agree with hamster that you need to let your school know and get in process for help with accomidations.

Hang in there. I have been to that dark place where you feel like others are trying to take away your loved one, and they are willingly going. I have been there. It's not a good place, so don't worry. You do deserve to be loved and you do deserve to be well.