I usually just forget about whatever it is that's troubling me and hope it goes away by itself. That tends not to work well. Otherwise, I simply gravitate towards the World Wide Web. There are so many things that I enjoy watching and reading and listening to, all easily within my grasp that I easily forget everything else. That tends not to work well either...
Also, re-happy is not a word. I know it's incredibly petty of me to mention something like this, but I will still do it anyway.