For "need to sit down and feel better because I feel unloved and miserable" Comfort Food, nothing can beat Macaroni and Cheese. The box kind: Kraft. Made up into one big bowl, perfect to hold in one's lap and eat with a spoon.
For: "I don't feel well and wish my mommy was here to take care of me" Comfort Food, I make Campbell's Cream of Tomato Soup - WITH milk - and grill up a cheese samwitch. (Yes, I know, it's spelled Sandwich.)