Have you talked with your psych dr? If you haven't I'd suggest to do that first. Talk to him/her, ask his/her opinon, whether your condition is controlled well enough to allow you to have surgery, and also willing to follow you closely post op, especially the first couple of years which are most difficult.
Check out
BamaGal's profile and all her posts, there's quite a bit of info there, and she is a bipolar who's had the surgery, is doing very well, and I think will be willing to help you where she can.
(((((((HUGS)))))) May your journey go well.