Hi, I was recently diagnosed with IBS , and the doctor told me to take a probiotic , Align, and Miralax. I have absolutely no problems with constipation. Quite the opposite: I have chronic diarrhea . He said that Miralax was fiber , and that the fiber would help manage the diarrhea. I m not so sure Miralax is fiber ..... Any thoughts? Should I be taking a laxative for chronic diarrhea?