When I was younger and at different times in life, sometimes had sensitivity to eggs and/or bacon and ham.

I had about a half year of chronic IBS following several long courses of antibiotics, which caused systemic yeast infection. I needed a detox, so I cut all caffeine, sugar, white flour and dairy (except skim milk) for about a month or 2 and the IBS went mostly away.

Diet was mainly bananas, grape nuts cereal, baked potatoes (plain) and baked chicken, green beans, mustard greens (plain or with splash of white cider vinegar).

Stress is a big factor. Try to reduce it, because it affects the entire body negatively.

That aspartame gave me instant mind crushing headache. Couldn't even have a breath mint without crippling headache.