What's funny is that at random time's I will suddenly just start singing this song. no I'm not joking at all. lol
If I'm in a bad mood this song will come into my head and I'll start singing it. By the time I'm done ( I have no clue what every word in the song is so I only sing the ones I know!) singing then my mood is pretty much mellowed out and I'm slightly happy again.
I really try to not let things get to me any more, especially if they are things that I have no control over.
Worry about what you can control, not about what you can't!