About a month ago, I had a roughly 12-hour spell of diarrhea accompanied by hours of foul belching and general stomach discomfort. The next day, though, I was feeling much better and dismissed it as something bad that I ate.

This past sunday the same exact thing happened -- 12 hours of diarrhea and foul belching.

With both episodes, the bowel movements became increasingly painful.

A litlte background may help: during the week, I don't eat much, and on the weekends I tend to eat much more, both good food and fatty desserts. I've eaten this way for a few years. During the four weeks between episodes, however, I ate in my normal pattern -- not much during the week and a lot on the weekend -- with no ill effects.

Aside from this problem, i'm a healthy, 38-year-old male, 5'8", 145 pounds.

Thank you so much for any insight you may have into my situation.