Thanks guys
I am slowly edging towards coping with the feeling. I think a large part of it is crazy blocked up sinuses and ears after an evil chest infection. I know that may sound even more crazy, but it does make sense.
Of course when you're hyper anxious every little twinge means the world is ending! The heart pounding means you're having a heart attack, and the pain in your left arm is not because you've been decorating all day but is impending doom!
I'm going to drag out my old relaxation techniques and give them a go again. Hopefully I can find some good ones I can share