Eat lots of protein and good fats, that will help fill you up and nourish your body to repair itself. I do know how you feel, and things like sausage fried with peppers and onions are my comfort foods when I know I need something tasty, filling, and nourishing to my system. Chef salads, salmon, tuna salad, all good choices as well. Avoid sugary junk, that isn't going to boost your immune system. Some berries or oranges might not be a bad idea, but nutritionally it is protein and fat that fuels your body best when it is under stress, in my experience