Sounds to me like you don't have a diagnosis you like yet, but are leaning towards SIBO. If I was in your position, I would demand that my GI set me up with a breath test for at the very least hydrogen, and if available, for the other gases, and if positive treat with Rifaximin for 2 weeks. If you "get better" during rifaximin at least you know that a bacterial overgrowth is causing some of your issues ... don't know what to tell you about ulcers. Good luck.