Don't give up. I know it's hard to not feel like it's all hopeless, but you need to keep fighting. I think it's important that you get the diagnosis figured out, so don't be afraid to be open with your doctor, because it is in your best interest. And I know deep down although you're frustrated (as am I right now with myself, so I know how you are feeling) I know that you truly want to feel better. Unfortunately getting well involves work and it's really tough to do that work when you're feeling so low.
I was dx'd with depression first for a few years and then bp in 2005. Since then it's been the same story for a lot of bps...trying to find the right meds etc. It's hard, but I try not to give up.
You have support here, let us know how you are doing and I really suggest talking with your doc. It will be to your benefit. Take extra care of yourself.