I just went through something very similar with one of my guys (Tanner). I ended up having him scoped . They took some biopsies of his stomach tissue and it turns out that he has irritable bowel syndrome and that has been causing all of the problems. Fortunately it can be controlled with diet (I just have to find the right combination of food!) This is not something that would have shown up on an x-ray and the only way to make a positive diagnosis is to put him under and have him scoped (but it is NOT cheap).

I am still trying to find a combination of food that he will eat and of course he doesn't like the prescription food

Good luck with Brodie!