Posted 4/16/2013 12:52 PM (GMT 0)
From my own experience, and from what my GI has told me, this isn't all that uncommon. The feeling that you need to pass stool, but there's no stool is tenesmus, which is a really common UC symptom.
When I was having nearly the same symptoms are you're having, I'd get urgency well before my body was ready to go to the bathroom. It was because there were ulcerations higher up in my colon. I never vomited when I'd have these bathroom trips, but I would come very close, and I would definitely be in a lot of pain.