I just wanted to post a condition that both my father and I have suffered from---and then learned to live with.
We get severe gas and stomach cramps if our pants are too tight. If we eat too much and our pants are tight we will get severe diarrhea almost every time. This frequently happens at restaurants because we wear nicer clothes (often too tight) and eat too much (ridiculous restaurant portions and dessert). Severe diarrhea comes within minutes after eating.
Wearing looser fitting pants--and not overeating--is the solution. Those symptoms do not appear as long as I remember this simple solution.
I should mention that I was misdiagnosed in my late teens. Doctors told me I had colitis or irritable bowel syndrome or spastic colon. All were wrong diagnoses. I wasted hundreds of dollars in medical costs and took prescription drugs which caused negative side effects.
Simply, I had pants which were too tight.
I help this post helps others.