BOOOO!!!
You sound like the nervous type.
Even the highest caliber players have quite high blood pressure and pulse rates during critical junctures in their games.
I'd recommend playing lots of exciting games and develop skills to deal with your arousal.
Consider lots of cardio or a cold wet towel in your lap.
I've noticed, that every time I play a game of chess online, (live/not correspondence) I become physiologically aroused around the 5th-6th move. My heart rate increases, I can't sit still, and I begin to sweat a little, I become slightly short of breath, etc. all despite playing in a comfortable setting within my own home.
It's extremely obnoxious, because it makes calculating accurately more difficult.
I imagine that I have this response because
a.) I haven't played many games yet (i'm a beginner, roughly 200 online games)
or
b.) This happens to everyone, and I have to learn to live with it.
Did you experience the same sort of physiological arousal when you first began? do you still experience it (even if the game means nothing)? did you grow out of it?
ps: I understand that everyone will become more physiologically aroused to some extent when they play, but I feel as though my reaction is more severe than what it should be.
thanks,
Jack