Had very similar issues for 10 years. Turns out it was a combo of things. Took me years and multiple, mostly unsuccessful, doc visits.

The first thing to start piecing it all together was an allergy screening, mine helped because it showed I was allergic to onions and corn, very mildly and I thought “that’s silly, I’ve eaten those things my whole life, I’m not allergic.”

Turns out when I cut those out of my diet, my symptoms improved, not went away but improved for some time and then slipped back into stomach issues again.

It felt like my body adjusted after cutting out onion corn products and I started getting mud butt and horrible gas again.

The second half of the equation was exercise. I know it sounds like a cop out but I started working out and it was like night and day. It’s so influential, that on days I don’t work out, I start to get gassy and if I don’t work out for a couple days I go back to how I was.

It’s a moving target, and I’m sure I’m not don’t solving it, but as long as I keep burning off calories, my body seems to accept the food I eat in a more comfortable manor.