Stomach problems (stroke)

This week I have one main objective: to get to the bottom of what is causing my stomach discomfort. I have had this discomfort for several months now, along with bad breath.  My GP has tried all manner of medicines without any success. I am becoming convinced I have some bacterial stomach infection and the GP needs to understand the source and treat that, not the resulting discomfort. Reading about strokes, long term stomach disorders don't normally appear as issues. I think the GP has to get to the bottom of this. If he can fix this with antibiotics I'm sure I'll feel so much better.