have you ever researched LOW stomach acid?
also are you sure its not celiac. Id start going gluten free and the other diet recommendations at the link above. go strict if you have symptom relief then add back one food at a time every other week. as long as your symptoms don’t change your good if they do, then that food is permanently out of your diet.
I had numerous problems with GI stuff until I went to a holistic doctor in Lubbock Texas about 6 1/2 years ago. Dealt with diarrhea, constipation, nausea, pain, cramps, diverticulitis, ulcerative colitis, acid reflux, literally ad nauseum for most of my adult life. His diagnosis was that because of large doses of antibiotics when I was a child, my stomach chemistry was screwed up and allowing what is basically a massive yeast infection. At times I would be okay, but other times I would suffer. He stated that those antibiotics along with my diet (too much sugar & food that metabolizes into sugar), my normal body temperature being so low (around 97.2) and the extreme stress I was under at work basically overwhelmed my GI system to the point that I would be bedridden for days at a time. He stated most people think they have too much acid in their stomach, as evidenced by Nexium and other antacid drugs being the number one drug group dispensed by doctors in America. According to him, my problem was not too much acid, but not enough acid. I know it sounds crazy, but he literally saved the quality of my life. He put me on a diet void of all sugar and carbs, no processed food, no dairy (except free range eggs), no fruit, and no grains. He called it the caveman diet. I could eat beef, chicken, pork and fish as long as there were no antibiotics, a list of about 8-9 vegetables and a few nuts (walnuts, macadamia nuts, pistachios and Brazil nuts. He also had me taking about 8-9 different minerals, probiotics, vitamins and other some other concoctions including dried hydrochloric acid capsules, It was supposed to last 30 days, and I woke up on the 14th day with no nausea or pain for the first time in well over a year. I actually loved what this regimen did for me so much that I stayed on it 40 days instead of 30 (a Biblical number). Since the 41st day, my GI problems have been virtually non-existent. When I do feel something “rumbling”, I simply back off the sugar for a few days and I an fine again. I can eat just about anything now, including lettuce, which used to upset me to the point that I would have to go to bed if I ate it. Now I can eat salads, and virtually anything else, every day with no worries. Below are a couple of links, one to his website and another link to a YouTube video that explains how the GI system works. I promise you, even if you don’t have GI issues, the information is mind blowing.
https://medical.veritashealthycommunity.com/meet-the-team/
Hope this helps.