Gennylou,
Have you done the "Spit Test" to see if Candida overgrowth might be contributing to your IBS? You can find a description and illustration of this free, do-at-home test by going to http://www.newleafhealth.com. Scroll down through the ThreeLac section until you get to the part that tells how to find out if you have Candidiasis. You'll find a link to the test in that section. It's VERY interesting!