I think that I might have irritable bowel syndrome, but I'm sort of having problems with the university student health system, and I think I would actually trust the diagnosis of strangers on an internet message board more.
For the past 8 or 10 years (almost half my life) I've been pretty prone to diarrhea. More recently, I got pretty sensitive to Immodium and other anti-diarrheal medication, so when I took it, I wouldn't be able to go again for over a week.
Then, starting last fall, things got a lot worse. Diarrhea, constipation, bloating, and gas happen a lot. For two days in December I completely lost my appetite. For the past three days I have been passing gas pretty much nonstop, and it smells really bad so I'm trying to stay at home because it's embarassing. For a week last fall I was pooping close to ten times a day, up to five times in the two hours between waking up and leaving for class. This is definitely getting in the way of school, too - I am late to class about once a week.
I don't have a bad diet, and I exercise (not as much as I should, but way more than the average American). I smoked for a few years, but I quit about a month and a half ago and think I am going to stick with it. There are days when I drink a lot of milk and am fine for 48 hours afterward, so I don't think I'm lactose intolerant or anything. I did have bloodwork done to test my thyroid funciton, and everything was normal. What should I do? My doctor didn't even suggest any dietary or lifestyle changes to try, so anything would be helpful.