I am currently being tested for IBS, as I have had severe bouts of constipation and diarrhea for well over a year. I have occasional blood, pencil thin, loose stools and external hemorrhoids. I am also experiencing a constant pain in my upper abdomen, coupled with severe nausea and a feeling that I am going to get sick. I had to submit a stool sample today, and I noticed that there were a lot of dark green, leafy looking substances in the stool. They were tough to the touch but tore apart when pulled. I haven't eaten any sort of green vegetable in well over a week. Any thoughts?