coconut flour and ground flax seed work great! xanthan gum is a laxative and can be easily left out of most recipes. I do use one egg in my recipe, maybe you could find egg substitutes?
I'm sorry you still have symptoms, but it can take years for the intestines to recover from a lifetime of celiac. Also, you can be sensitive to other grains as well and as other people have answered, other ingredients. The processed gluten-free foods can be especially harmful as they contain an array of fillers and substitutes. Xanathan gum, for one is...