Have you had any small bowel tests done? A colonoscopy is great but doesn't go through the small intestines where crohn's typically is...there's no bleeding with IBS unless you have a bleeding hemheroid, a sigmoid doens't even go as far as a colonoscopy so that's pretty un-necessary if you've had a colonoscopy already....you need to have your small bowels checked.
bee propolis caps 500mg one cap twice/day
omegas 369 caps one cap twice/day
probiotics 10 billion cfu once/day
vitamins C-calcium ascorbate (easy on the gut) and vitamin A each once/day
Prodiem fibre supplement one cap before bed
I've also altered my diet (no junky stuff at all, processed, fast-foods, refined sugars, ect) and exercise regularly.
I went from 30+ bloody BM's/day with lots of lower back pain to an average of 5/day no bleeding no back pain and completely formed stools, still have severe urgency issues.
~~~~~~~~My bum is broken....there's a big crack down the middle of it! LOL :)~~~~~~~~