That sounds very familiar. Myself has been "diagnosed" with a variety of diseases. IBS was the first, followed by gastric ulcers, etc. After a long, long time somebody ended up asking if i can handle milk. We tested it and found that myself reacts on the sugartype contained in milk (Lactose) and many other products. Well, after a few weeks i was feeling much better and many symptoms went away. Probably worth checking that out. Give it a try
Cheers, vdive