Just thought I'd post some stuff here, cos this is a problem of mine that I've been suffering with since I was 10 - only I had NO idea what it was and I was too scared to ask my doctor about it until I was 18 and got switched to a female doctor

In the last two years I've done a lot to try and sort myself out - still doing a bit lame at times (I have phases like Juliana, lol), but I've found some stuff that might help some of you:

Juliana mentioned the IBS diet - there's some awesome infomation and products on www.helpforibs.com

This is a UK site, but it might help you locate what you need so you can find it elsewhere:
www.hollandandbarrett.com

This place sells a wide variety of specific foods and supplements that help for specially tailored diets such as dairy free, gluten free, caffine free etc (a lot of which apply to IBS sufferers) also does a lot of organic produce - again, this is UK based:
www.goodnessdirect.co.uk

Hope those help out a little bit for anyone who's suffering - I'm still figuring it all out myself, but I found a great deal of helpful stuff on there.
xx