Inoperable - I think most of the people here will tell you that you must keep track for yourself what foods set you off. I will tell you what foods are good for me and maybe you will get some ideas of what to try.
First of all, I am very sensitive to oils. I cannot do soybean oil, and it's in most baked goods, so I don't eat those. I use extra virgin olive oil for salads, and also to cook with (it burns quickly, so you can't really fry anything).
Cooked, steamed or lightly sauteed vegetables are good.
Eggs are good.
I use exclusively goat dairy products - milk and yogurt and cheese. It's easier to digest than cow's milk. I don't usually eat any ice cream.
I make homemade chicken soup and always have it on hand.
I avoid corn and potatoes, although I have found a "salt and pepper" organic potato "fries" in the freezer section of my grocery which is good and does well in my stomach.
Fish is good. Fresh fish and tuna, salmon and sardines in the can.
Beef is good, but I try not to eat it for dinner because it takes a while to digest. I can tolerate fresh tomatoes, so it's a treat to have a fresh taco with seasoned beef, avocado, tomatoes, lettuce, and yogurt.
I make hot cereal for breakfast that is a mixture of 5 grains. Oatmeal alone doesn't do well.
For dessert, I have fresh fruit with plain yogurt.
I limit my intake of sugar. Right now I only have a little maple syrup or honey when I need to sweeten something.
I hope this helps you get started.