I see a lot of people have suggested books specifically for AS, and thats great.
I'd also suggest just regular books on how to handle stress. I don't know of any off hand, but there are so many books about stress management. I'd start with the library so you don't end up buying a lot of them. I'm sure that you can eventually find one with techniques that work for you.
Just like NT's, those of us with AS all respond differently, and different techniques work for different people. Deep breathing and relaxation work for a lot of people, both AS and NT, but it never did for me. What works for me is purposefully changing my thoughts at the time. I catch myself thinking something stressfull and on purpose think in my head something positive, as cheesy as it may be at the time, and continue repeating that internally until I stop remembering to and start concentrating on something else. It helps me. I found that idea in something for NT's.
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I'm giving it another shot. We will see.
My forum is still there and everyone is welcome to come join as well. There is a private women only subforum there if anyone is interested. Also, there is no CAPTCHA.
The link to the forum is
http://www.rightplanet.proboards.com