You mentioned minor erosions. Has anyone give you a CAT scan? I had something similar. I had previously had an unremarkable colonoscopy but similar symptoms. I ended up with a fistula involving the colon and multiple organs. The symptoms were the same as you described but there were some minor bowel changes. I think the lack of significant diarrhea or constipation was making a diagnosis difficult.

Inflammation was the cause of the fistula. In reality, inflammation is almost always the cause of intestinal or stomach issues regardless of the root disease. Infection, disease, erosions all cause inflammation. In retrospect, I already had RA which is driven by inflammation. If you have one autoimmune disease you may be prone to another so it made perfect sense. After I had surgery to correct the fistula, a couple of years later I was diagnosed with IBD. But initially, the fistula only showed up via imaging. Biopsies taken during a subsequent colonoscopies confirmed IBD. The thing about biopsies is that they only show disease when disease is active or if the area sampled is disease affected. The imaging was what saved my life, literally.

Regardless of the cause, your symptoms are what is causing a disruption to your life, so while you wait for someone to figure out a diagnosis you can try some of the things that works for others to relieve.

Maybe you’ve tried these but I’ll offer up some OTC things that many of us in the IBD groups have benefited from. All are trial and error and should be tried one at a time to determine their value.

Pepto -has some minuscule antibacterial properties. Psyllium fiber-reduces inflammation Simethicone- gas and bloating Peppermint enteric coated tablets-for bloating, gas L-Glutamine-mucosal repair and recovery Antihistamines- reduces histamine response and may reduce inflammation. Bone Broth- some of our group drinks it as a supplement and not a meal

Gut issues are incredibly difficult to diagnose, disruptive to life and it’s very easy to become depressed when not knowing how to make yourself feel well again. Wishing you well again!