I'd try the breath test. I mean, it's not painful or anything, so why not?
I wonder if Welchol would help in the stomach? I know it helps in the intestines, and I think it would work in the stomach too, but I don't know anyone that's tried it. It only works on bile, so I don't think regular stomach acid would qualify. Depends on what kind of acid you have, I guess, if it would help any or not. But it can make you constipated, and I think that's a problem you already have? No need to add to it.