You may have other sensitivities. Some of the ones I have/had are Nightshade family. Potatoes make me very ill. (potatoes, tomatoes-I can eat some small amounts of these now, especially yellow ones, eggplants, peppers are some of the nightshades).
Oxalates: http://www.lowoxalate.info/recipes.html This shows a list of some of the foods and very high...