Ferrets my brother, I'm sorry to hear this. It's a bit of a surprise, because I read so much confidence and knowledge in your posts.
I don't want to pry, but have you identified the source? This is fundamental. If you don't squash the source then this **** doesn't end.
I had horrible anxiety attacks, similar to what both you and Boof describe. You know what? They ended when I buggered off and joined the army at 17. The source was my bloody ol' man. For the first time I was free of that dastard. Kind of funny that digging shell scrapes in frozen earth, barking NCO's, and Gulf War One didn't hold a candle to the stress my crochety ol' man gave me.
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What, is it school? Home? You don't have to tell us knuckleheads on TWC, but if you identify the source and cut it out of your life, well, it did it for me. Now if I could only get Mrs. Arrrgh! from hitting me with the frying pan...