Wow, what a pain (no sarcasm intended)! It's so discouraging when doctors minimize a problem...Makes me feel kinda crazy.

I read through your "laundry list," and did not see anything about your gall bladder. Before I had my gall bladder removed, I used to have bad attacks of belching. They went away after the surgery. I get them occasionally now if I eat too much fatty food, coffee, carbonated beverages.

Maybe acupuncture would help? Haven't tried it myself.

Hope these ideas might be helpful to you. Good luck and best wishes.