I like your comment about your hair growing back. I swear the same thing happened to me after I finally got the courage to end a stressful relationship. You are definitely doing the right thing. I know it sux, especially the first couple of months, but trust me. That one day will arrive where you wake up and BAM. You are totally over this person. Also remember, history tends to repeat itself. Whatever poor slob she ends up with is going to have to endure what you went through. Besides, once the trust is broken it is never ever the same. Just be aware that she will one day try to make contact with you. It may be a year from now, or it may be next month, but it will happen. Be strong. Just move on. You will be happy you did.
Good Luck.