I know that this is an old trick but one I find that work great for me when I get thinking obsessively like that and when my anxiety is running high.
Just take a coin (I like to use a small coin like a dime) and use both hands and just keep turning it around with your fingers, after a while your mind tends to be more focested(sp) on turning the coin around and your thinking becomes more clearer.
When I when't in for my hearing at the frist ? I freeked out and had a p/a, I then took out a coin and was able to get though it, it was still rough though but it helped me to think clearer without all the thoughts running around in my head, I like the smaller coin because it harder for me to turn it but at the same time it distracts the mind keeping it busy
dave