Maybe relaxation or meditation might help. It's hard to shut off your mind when you have anxiety. The website withandrewjohnson.com has a free relaxation mp3. I like him. I bought quite a few of his mp3's. I have to listen to them quite a few times to learn how to relax properly. I try to listen to one mp3 at least once a day. He has a soothing voice and a Scottish accent. I think he sounds like Sean Connery.
Or listening to music on an mp3 player while you exercise can help too.

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