Sometimes you hear a song and it reminds you of a point in your life and you know if that song had been around at that time, it would have been your personal anthem. The new song "Breathe" by Superchick, on their "Rock What You Got" CD is one of those songs for me.
When G and I broke up, everytime I would cry or have uber-negative (And honestly sometimes scary) thoughts, I would just repeat over and over "just breathe, all you have to do is breathe." It didn't make me feel any better, but it helped to calm me down a bit so I could do just that - breathe.
Sometimes I still have to tell myself to Breathe, for a variety of reasons. Most of the time it still works.