There really are so many things you can eat if you have a small refrigerator and microwave in your room.
--Costco sells pre-cooked frozen shrimp, teryaki chicken, beef strips, lightly breaded chicken breast patties, and a few other items I can't think of now. Ideal? No. But pretty damn good items for someone trying to stay in shape and doesn't want to resort to eating junk. All they require is thawing and microwaving.
--You can make a shake from several ingredients, including nuts, nut butters, seeds, protein powder, milk, frozen berries and bananas, and healthy oils.
--Canned chicken doesn't stink like tuna does. Sardines don't smell nearly as bad as tuna, actually.
--Cold cuts. Get some decent quality ones. Make a sandwich.
--Some snack items like beef or chicken jerky; whole grain pretzels or crackers with hummus; fruits; veggie sticks; mozarella sticks; and so on.
There really are so many options.