From the perspective of a Mom with a kiddo with multiple allergies, I look at your list and don't see what you can not eat, I see what you can eat!
In addition to the questions already asked, what food categories are you looking for?
Such as you can eat fish and shellfish! And there are so many different kinds that can be cooked so many different ways. Meat, and chicken are good. Lots of veggies are not night shades. Fruits, nuts, and around here there are many many gluten free options in our grocery stores.
Do you like to cook? Or are you looking for things to buy, heat and eat?
You can not have sugar, can you use maple syrup, honey, sugar substitutes?