Like you, I am young, watch what I eat, exercise, get plenty of sleep, I'm not stressed, etc... ie try to do everything right. But to no avail. I look pregnant
most of the time and it's really quite embarassing. Not to mention how challenging it is to be at work and have mega cramps and need to run to the bathroom all the time to pass some gas!
Anyways, have you had some tests done such as a colonoscopy, gastroscopy, xray of your small intestine, etc?