My 15 year old son was diagnosed with IBS five years ago. Doctors suggested he stay away from bothersome foods...and this was the only help we received. The last few years have gotten worse. I recently took him to a chiropractor who tested him for food allergies and we found he is either allergic or sensitive to dairy, beef, wheat, gluten, peanuts and soy. We all went on an allergen free diet for about a month. It seemed to be the answer for the first week. Then the chronic diarrhea returned (3 diarrhea BMs before school, and usually once every hour (class) through at least lunch). Perhaps we didn't give the new diet enough time, but it didn't seem to matter; the diarrhea still controlled his life.I talked his doctor in testing him for small intestinal bacterial overgrowth, hopefully next week. I don't know much about this, but I think he should be tested for lactose, fructose and sucrose intolerance.I'd also like to try VSL #3 or S. boulardii...any recommendations?Any and all advise/suggestions would be greatly appreciated. Thanks!