My distended stomach is driving me nuts, I need some tips?

I am currently on bipolar medication which I suspect is making it worse. However, having said that, I have always had a distended stomach, no matter if I worked out, was much lighter in weight, or anything else I have done. Are some people just born that way? I think it could be an allergy but those blood tests are very expensive.

Did any of you find wheat was an allergen? Or gluten and how did it affect your stomach after removing it. (The gluten not your stomach!!).

I really need help it’s getting me so down, I don’t go out any more unless I have to! It just bloats up and gets out of control.