I was recently diagnosed with IBS. My symptoms include, sever constipation, black stools, upset stomach when I eat and when I have a bowel movement. I had been taking an over the counter drug and it kept me regular. However the stools each morning were initially hard followed immediately by a loose stool. I was prescribed a IBS drug which while I was on it (taken three times a day for two weeks) I was regular but still has some stomach discomfort. When I went off the drug my symptoms returned and the over the counter drum is not effective. I had a series of tests, scopes, colonoscopy and an endoscopic ultrasound. I was not tested for parasites at all. I am on a FODMAP diet and my constipation is terrible and so far I have not seen any improvement. Any advice.