I'm the same as IamCurious and also have Crohn's-Colitis. Although all my main symptoms are gone now (mucus, blood, pain, urgency) I still have many foods aside from Gluten that strongly effect me. Certain rices, milk, certain probiotics, some starches (from rice and gluten alternatives) and some yeasts used to make gluten free products.
I takes a while to figure them all out. Everyone is a little different.
Crohn's-Colitis just so you are aware is Crohn's Disease, but isolated to the colon. So no small bowel involvement.
Have you tried the SCD diet? There may be some basic foods you can tolerate on that and see if it helps reduce your symptoms. It's perhaps worth a shot, but very difficult to stick to. At least going through the intro diet might help flush out items that bother you. www.breakingtheviciouscycle.info
Here are two great cookbooks that makes SCD life somewhat tolerable -www.grainfreegourmet.com/buygrainfree.html
Some of the recipes my 'normal' relatives now cook. It's that good.