Hmm, sounds like your metabolism is in a rut..
Start by FORCING yourself to eat at least every 3 hours, get a balanced diet with a calorie intake based on your bodyweight times i'll say 14 to start off with, divided by how many calories 1 gram of protein, fat, and carbs each give you, then divided by how many meals per day you're going to be eating (6 or 7).
Also, lift and do cardio, these things will raise your metabolism and MAKE your body want to eat, there's no way around it.