Sannah is right, but you can do something right now, like (forcing if necisary) doing something that used/or does make you happy. aka Distractions.

Therapy is important, and can help you to recover. It will be hard to get up and go but, sorry you have too. (any other allternaitive is not quite what you want, TRUST ME)

I hope your day is going better, Smiling helps. And if those didn't help, lets try this one for a laugh... and if those didn't work either then how about a (all of this is trying to make you smile, since it helps, even if you don't want too)