NL tournies, all in pulse races...even in freerolls

Ok, this bugs me. When I go all in my pulse races. I have high blood pressure anyway, so I can get a bit light headed when this happens. Aside from being annoyed at myself, it's probably a visible tell in some fashion (though maybe not, it happens whether I'm bluffing or have a lock hand). It's certainly not about money, because it happens in situations where the money is basically meaningless ($5 SNGs for example).

Mostly my question is, any tips for calm thoughts people use in all in situations? I feel so stupid, I'm not normally one to let my emotions get the best of me.

In limit, even at the edges of my bankroll, I only get this feeling a little bit on really big hands. There it makes sense to me, there's a lot of real money on the line.