I think we all tend to crave carbs when we are depressed but I think the best thing is a balanced diet that meets your nutritional needs. I know exercise increases endorphins which promotes good feelings. I always found walking the best exercise... whether late at night or early in the am at your local mall. My husband is very tired most of the time but he paces it based on his treatment schedule i.e., today he washed the car but tomorrow is chemo day by Thurs all he can do is reach for the remote.