I actually thought of having SIBO. The test for it is not available where I live but I got to have 2 courses of antibiotics for it, including rifaximin, with no improvement. What helped me at some point was intermittent fasting as I was trying it for insulin resistance and prediabetes. The pain became milder and less frequent and the bowel movements became more regular, and as the weather is getting very hot and I wear looser fitting clothes ( no need for tight warming pants) I rarely have this symptom now.