My sister had Celiac's disease and I have a sensitivity to wheat (although not the actual disease). In Brooklyn there is a store called Fairway Market and they have a whole section of the store dedicated to wheatless foods of all kinds. You can get cake mixm brownit, pancake, frosting, chips, cereal, bread, cookies, almost everything (though sometimes their selection varies and it is at times better than others). Although most of it tastes like carboard, some of it is actually really good.
If more places had such a selection, I am sure my sister would have done a better job combatting this disease.
I hope it all works well for you.