I like using the mood tracker here. It's interesting seeing how it has fluctuated since I joined... Ever since the possibility of my diagnosis was brought up that first time, I've been keeping a mood journal, as well. Although, I've never had any doubts about depression. I consider myself just depressed when it's sorrow. I consider heavy depression complete apathy - the moments in which I just cannot be bothered to try to care about anything. It's my other moods that I have trouble distinguishing.