To add onto what doodled said, I've noticed the cycles of depression I have put myself through in the past. When I was still doing IC, my IC suggested that I might even be addicted to being depressed and use specific actions that put me or keep me there. I've read in several places how our emotions/moods can be tied to our actions, so one can induce the other.
As for the being addicted to being depressed, it's a habit I've formed in the past to cope with change/fear. Depression is what I knew, it's what I was used to and any change to that led to the unknown which I feared.
Accept what is, let go of what was, and have faith in what will be
