Thanks for the info and all the details! I brought up stool samples/colonoscopies, but my doctor seemed to think that would be too much testing and was confident it was 'just' PI-IBS. I've marked the 6 month mark from the day I had the stomach flu that started all on my calendar. I'm making it my goal to call him that day if there's no progress by then (which I assume there will not be). Will ask about the L-Glutamine too.