Several years ago I was diagnosed with IBS. For years I have been living life as if I have IBS, but an episode I had a few days ago that has continued has got me wondering. Felt good, went grocery shopping and out of the blue I got a sever stabbing, burning cramping pain in the most lower part of my abdomen in one spot, around distal sigmoid area'ish. It was so painful it was hard to move and I immediately needed to use the restroom. I was breathing really hard trying to work through it till I got to the bathroom. I hurt so bad I didn't want to go. I have always had to sit on the toilet for 15-20 mins focusing on having a bm just to have one. Doesn't mean I am constipated because most of the time it is soft stool. Sometimes I will have an immediate urge and it will be explosive. So this day I am sitting there for a while, have a soft stool, small at that, and then diarrhea. Not a lot. No this is going to get graphic. Sorry. It smelled sour and I was still having massive pain. I knew I had to get home. Got home and went back to the bathroom and had more diarrehea with what looked like some unprocessed food, again not a lot and smelled very sour. With each time to the bathroom I felt like I was going to pass out, had goosebumps, breathing deep, severe burning and continued to burn with defacating. I have slight pain in that area since and off and on cramping. Diarrhea once per day since and later in the evening today now have cramping all over. So severe it is very hard to move and breath. Anyone have any ideas? Is it IBS, or is it colitis?