A large amount of people with BPD don't feel the manic states are a problem, just the depressive states. I'm not manic depressive, but my understanding is people feel pretty good while in the manic state, but it is hard on their bodies and hard on those around them.

I once had a coworker who was diagnosed as depressed although he actually had bipolar disorder. He was put on antipressants and it put him in a permanent manic state. He made a lot of mistakes during that time and even though he felt good, it was hard on him. Even when his pdoc rediagnosed him and put him on mood stabilizers he was never the same.

Discuss your concerns with your doctor. Mania can be very dangerous. See what the doc has to say.