Crohn's Disease & Ulcerative Colitis Support Group
Crohn's disease is a systemic inflammatory bowel disease (IBD) of unknown cause, that results in chronic inflammation of the intestinal tract. It can affect the entire gastrointestinal tract from mouth to anus, and can also cause complications outside of the gastrointestinal tract. There is no known medical or surgical cure for Crohn's disease, but there are many medical...

What did the GI say about what may be causing your diarrhea/constipation?
Crohn's would have been discovered in your colonoscopy and it doesn't cause bleeding usually.
Good luck
Also agree the doctor would have found some indication during the colonoscopy. Have you discussed the full range of symptoms you mention here with your doctor?
Anyhoo, good luck with the ragin' 'roids!