Yep! I have indeed heard of SIBO. I have been tested for celiac (negative) and had a sigmoidoscopy (negative). I have a hunch that my problems are indeed related to some kind of bacterial overgrowth/imbalance. My first clue came when I was on mega-doses of a powerful antibiotic for a sinus infection. Mysteriously, when I was on the drugs, all IBS symptoms disappeared as if by magic. I don't believe that treating this condition with drugs is the answer however. And I no longer engage in seeking help from the medical community. I do believe it is possible to restore balanced flora naturally, without drugs. I will think long and hard before EVER taking a prescription drug again. BTW, Couldn't high fecal fat levels be indicative of a gallbladder problem?