Sing, from time to time. It doesn't matter if you think you're the worst singer in the world - you can always find a private place to do it. For the few minutes while you're singing, you won't think about the other things going on in your life that are causing you pain.
And if you really
can't bring yourself to do the singing yourself, listen to some music performed by someone else. Don't just have your iPod in while you're doing something else - really listen
to what the lyrics are saying, and what the melody and harmonies are doing.