Where do I start? I am so emotionally stalwart that hardly nothing has a big effect on me. As such, I don't have bad days, per se. Or... perhaps bad days are so common that they are no longer "special" occurences, and as such, don't effect me...
To the point... I am a big fan of junk food. Quite honestly, I consume more of it than "regular" food. In regards to comfort food, I think I turn to junk food when I've had a bad day. Reading this paragraph, then looking back at my previous should give you an idea of the amount of junk food I consume on a regular basis to comfort myself. Seeing as how I can't afford the majority of the "healthy" stuff, I think my overconsumption of junk food has a lot to do with my budget. lol
Aside from junk food, a few of my favorite comfort foods include a variety of breakfast foods like oatmeal and plain cereals - cheerios, cork flakes, raisin bran, etc. Another of my favorites is classic chicken noodle soup, preferably Campbell's, or soups and stews in general. Unfortunately, I never seem to have this stuff on-hand, so junk food it is... (...and, no, I have not gained weight from eating this stuff; might be prediabetic, though) lol