Hmm, sounds kinda like a thrombosed hemi I had last year. The pain got better then it went away on its own. It came out of nowhere so I didn't think it was a hemi either. If it isn't gone in a few days you might have your doc take a look just to be sure.
34 year old female, Diagnosed Ulcerative Colitis 5 years ago
Current Meds: Remicade every 6 weeks, Prednisone 10mg (tapering), Prevacid, Sustenex, Lialda, Lexapro (anxiety), Synthroid, Iron, vitamins, Fish Oil
Expecting first child 12/08 via gestational surrogate!!!!