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...

Still, it may not be agreeable. I think when you are really in the weeds with a flare up, it's just eat what you can tolerate or crave. Staying hydrated is really important.
You might want to check out the CCFA website. Lots of educational information on medication, treatments, etc. http://www.crohnscolitisfoundation.org
Talk to the doctor, check out the websites rmb listed and good luck!