[pling]

This.

Ex IBS sufferer here.

Fixed it myself after 3 years of hell from doctors who quite clearly were a) short of any realistic knowledge on the matter and b) quite clearly using me as an experimental subject for everything the drug company was pushing at the time.

Worked out how to reset it myself: just drank water for the best part of two weeks and low end carbs (bran flakes with water on) and nothing else. Felt like crap for about 4 days then started to improve. After my butt stopped wrenching daily, I introduced normal foods back one at a time over the space of 3 months, ending with meat and heavy carbs.

I got these steps from a microbiologist rather than a doctor.

That worked for me wonderfully.