My counsellor used to tell me that feeling depressed is your body telling you something is wrong. Whenever I have a day when I don't do anything, I feel horrendously depressed and lonely. It makes me worry that when I feel okay whilst I'm busy it's just because it distracts me from my underlying feelings as opposed to me genuinely feeling okay (if that makes sense- i.e. that I'm depressed all the time and not improving at all, only distracting myself temporarily)