meshuganeh, try a gluten free diet for two to three weeks and reevaluate. I was in the exact same position as you 18 months ago and after being gluten free for 2 weeks my bowel issues were gone.
I've been treating my IBD & joint pain with sulfazine for a few years now and I have been doing well, but I was surprised that after a few months of being gluten free my chronic and subclinical knee pain was really improved. This is an old injury that kind of aches periodically, and has done so since I hurt it when I was 16, but it hardly hurts now. Weird.
I was very skeptical about this approach because my rheumy had tested me for celiac and no endoscopic biopsy had indicated celiac. I do not have celiac disease. But I am apparently intolerant of gluten nonetheless.
Given your username I assume you are Jewish. I adopted my gluten free diet a few weeks after Pesach. I looked at it like a 2 week chametz avoidance (although it's Pesach sefardi style because rice is good, yay, also corn!). It wasn't that hard to do. Give it a shot.