NYC - I'm sorry you're having such a hard time. Hopefully the beta blocker will help. I agree with Paj...try a Benedryl. I take one on days when I just can't shut off my mind. I'm actually taking one tonight. I think a good night's sleep would do wonders for you. and, if the rubber band thing stresses you out, don't do it!
It's just something that I used as a reminder that my life is not my past, it's my right NOW. (((HUGS)))