This is really an interesting queston. For over a month now I've been so low I hurt myself as a distraction. Then today, something as simple as a gift and I am swinging the opposite direction. I have been restless and giddy all day. And, well, something I've been missing for months, HAPPY.

How much of this was controllable? Perhaps happiness is to some extent under our control.

But, loss of hope is not. And THAT is the source of Depression