Yes that’s what a doctor diagnosed me with when diagnosed with the fibro. Ive had basic stool etc tests all along. I’ve had stomach problems since childhood. But recently a gastroenterologist sent me for a stool test that involved about 8 different vials and some had different chemicals in them. Came back positive for C.Diff. Since I had taken antibiotics for about a year for “sinus infections “(another great fibromyalgia symptom) it made sense.was given antibiotics for it. I don’t see much difference in my stools but retested negative now. Nothing has been done or addressed for the IBS though by any doctors . It’s awful. But like I said I’ve had diarrhea since I was a child. All the time. And still do. I just deal with it. Along with everything else.