I also suggest reading the book Real Life With Celiac Disease by Melinda Dennis and Daniel Leffler.
Tons of excellent advice by 50 celiac experts--on everything from the diet to living with WEs to nutritional advice to what the disease is all about. This book is awesome. Trust me!
Here is another helpful article on tips for living with WEs (wheat eaters) and how to avoid cross contamination in the kitchen and in your home.
Anything else you need, just holler. And "IBS" is not the same as celiac and I think you will be pleased to see that "IBS" go away on the gluten free diet. My "IBS" surely did!
If I were in your shoes, I'd find an endocrinologist's RD who can help you figure out the best
diet for your diabetes and celiac. Call the endo's office or your local hospital.
You can do this. Welcome to the forum and the celiac family.
Thanks for the great advice!