Put some upbeat music on and dance around like nobody's watching If there is decent sun, get out into it. If not, wrap up and have a brisk walk Eat 85% dark chocolate Gratitude - find as many things as you can to be grateful for If it's winter where you are, make a hot chocolate with cinnamon and nutmeg (and tiny pinch of chilli) and appreciate the rest season.

Hope you feel better - assuming you're in a bad mood that is :)