I went a differet route when I started feeling that really really depressed feeling. I did research online about grief, and about depression and found something that just clicked with me. It was an article that someone wrote, but the one part that stuck out most was...
It said, aside from writing out your list of things to be grateful for each day, and for all the reasons you have to wake up in the morning. It said to randomly just compliment someone, to bring just a small ray of sunshine to someone else's day, because although self-serving in it's own sense, it also helps to pass along the sunshine without causing myself any actual effort, aside from the effort to be positive.
I started doing this with my friends and my coworkers, and after awhile it stopped being such an effort to be positive. I'm not always sunshinny and happy all the time, and by no means am I anywhere near chipper, but I am not... hide under the covers and let the world just die around me either!
Self respect is an armour that none can penetrate- unknown