Sorry you're so anxious. Ever try meditation?
If not, there are tons of guided meditations on Youtube. Here's an easy one: [youtube]http://www.youtube.com/watch?v=Jyy0ra2WcQQ[/youtube]
Tim Page, author of Parallel Play(and fellow aspie), says meditation really helps him. It helps me tons.
I find when I'm on the verge of a melt down it's usually due to the fact that I'm not practicing healthy boundaries, not being honest with myself and giving an honest yes and no. So I ask myself, "What is it that is bothering me?" Then I come up with a solution. If it's millions of thoughts running in my mind, I get out a sheet of paper and organize and prioritize them. If it's too bright in the room, or too noisy, I remove myself from that place. If I said yes to someone when I really wanted to say no, I apologize and reconsider my decision in order to be kind to myself. And, as always, I can only speak for myself! Meltdown city, I can certainly understand!