I want a baby!

My husband & I have been trying to get pregnant since May. Instead of being pregnant my cycle has just stopped. My doctor cannot figure out why and basically told me to stop seeing her. I'm so lost and confused. I've gained about 30 pounds, have no period, all negative pregnancy tests, but still have crazy PMS mood swings every now and then for a few days at a time.

1) how can I naturally start my cycle again??

2) what then are the best positions to get me pregnant in?? I've heard a lot of contradictory theories lol...

3) anyone know of a good doctor in the Tulsa or OKC region for this kind of issue? No one around my area (SE Oklahoma) will do anything...