Unfortunately a lot of things, mainly things with flour - bread, pizza, cookies, etc. Fortunately though there are a lot of substitutes and places you can buy food with the substitues.
thanks so much. you've been very helpful. i feel silly but i didn't even really know what all foods do have gluten in them
This is a good website with a lot of gluten free info. I also had that bad stomach pooch. I don't have a gluten or lactose intolerance but I believe I have food allergies that flare up sometimes so I try to limit the intake if I can.