Anxiety attacks are not something that I'm familiar with ... not the chest-crushing kind, anyway.
The closest I can relate to is a certain phobia of mine, that when I experience it my mind continues to function as if nothing is wrong, but my body refuses to respond to my conscious control; or if it does, then it responds very slowly and deliberately. The only thing I can do about it is to acknowledge that it is happening, try to relax enough to regain basic control, and simply endure the situation until it is over.
Sorry ... not much help. 
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