What do you do when you are feeling low and depressed?
Try cleaning the bathroom.
How does it work?
The main reason for depression if you evaluate it is self pity. A feeling of frustration at your state wishing things were different. Keep yourself busy and help others and depression will melt away.
When you clean the bathroom, you get to spend some time with yourself, you get to finish a job that you have been puting off since ages and as the floor starts to shine again it lifts your spirits.
You can also try ironing clothes or arranging the wardrobe. Works the same way. The shift from a state of disorder to order instills the same state on your mind.