Try keeping a food journal to see what really triggers you.
I don't have a problem with the usual suspect foods. When I came up with my list: gelatin, maple syrup, brown sugar, dark chocolate, corn starch, any kind of packaged potatoes .... I googled my list with the words food intolerances and food allergies. I came up with sulfite sensitivity.
I can't eat most corn chips either, although I have no problem with fresh corn. It's the packaged foods that are my biggest problem. I get along fine if I cook from scratch, using real foods. I can eat tomatoes and potatoes just fine if I start with fresh ones.