Welcome! You might want to check out a diet designed for patients with Crohn's and ulcerative colitis called the Specific Carbohydraten Diet (SCD). It is based upon the original Celiac diet...which is more than gluten-free...it is grain-free.
The author of the book, "Breaking the Vicious Cycle," argued the original celiac diet, grain-free, is more effective than the gluten-free diet.
Perhaps the SCD can help you with both celiac's and Crohn's. There are a lot of testimonials on Amazon.com. It might or might not work, but at least it is a healthy diet. And we are big believers in the homemade yogurt part of the diet.