I have IBS-C. Don't have it all the time, fortunately, but I've had this episode for a month with no letup in sight. Citrocel finally does its work, but as soon as I'm cleaned out, it starts all over again. This time I'm having lots of heartburn and belching, no matter what I eat. Since IBS is mainly a condition of the bowels, I'm wondering if this is something new and not part of my IBS. My doctor says if I don't improve in the near future, he'll order an upper GI. Does anyone else have upper digestive problems with their IBS?