In late 2012, in the span of a few months, my girlfriend of four years died, I lost my job and my money and got in a car accident that left me with lower back pain that continues to this day.
I was not happy for a long time after that.
But I pulled through by concentrating on things that made me happy, as soon I was in any shape to do so, and kept on doing those things.
I'm not a really joyous person to begin with, but I've been able to find some modicum of peace.