Whenever I am down in the dumps I listen to some DJ Okawari.
edit: I feel bad for just posting a song, so lemme explain. I pretty much have a playlist on my phone (that happens to be mostly upbeat jazzhop or whatever) that I reserve to listen to only when I am sad or anxious. It's kinda created this really easy way to settle me down. Anyway this song is like the standard for that playlist, just so charming, somehow! Hope it helps someone else out.