I've been there. Remembering that it is bipolar and if you can manage to wait it out will help, uhm, sometimes I've developed a belief that I'm already dead so, there isn't any purpose to suicide like, I won't die anyway but, then I try har, proving myself right...um.

Only thing I can say is, it is bipolar. Wait out the episode. For the majority of people with bipolar, even bipolar depression rarely lasts more than 8 months, typically, mixed and mania are shorter.