Hi, I'm still waiting to see a gastroenterologist but my symptoms point to IBS or diverticulitis. I've had symptoms for about 5 years and already had a number of tests, all clear. Can someone please describe exactly what a flare up feels like, where the pain is and how bad. Mine is left hand side, groin area. Maybe I have a low pain threshold but it is agonising, as bad, if not worse, than childbirth. I just wanted to know how bad the pain is for others. THANKS, Maggie.