I have had the same problem for many years. There isn't much help out there. Doctors treat it like a stress problem which it is NOT.
The only thing I have found to help is Questran. It is in a powder form to be mixed in liquid. Colestid is much better because it is a tablet. The diarreah is caused by bile constantly dumping into the small intestine, which cannot absorb all of it. Both Questran & Colestid are bile binders. It is the only thing that seems to help. I have tried everything and spent thousands $.