One thing that I still do today when I get a little stressed, anxious, or depressed is listen to very relaxing music. If I'm driving I turn the volume just loud enough to hear it well, but not too loud as to block my thoughts out. I use the music somewhat as a "white noise" to clear my head and begin to think of good things, maybe even get a little nostalgic about some good memories. Sometimes I just think of nice thoughts and scenery. I think everyone has their own concepts of relaxing music; so, you've got to find what's right for you. I personally like a lot of instrumental stuff - both orchestrated and electronic. My favorite group to listen to in this regard is "Boards of Canada." It's electronic and very trippy, but it really takes me away to a more peaceful place when I need to. It's a simple idea, but it can really help keep you calm in a moment when your mind is telling you otherwise.