No offence meant when I say this but you could just be a wuss when it comes to pain? I know people who run a cold sweat and babble like little girls when they cut themselves. Could be the same thing? I've only felt how you described when I've been in serious pain, like the time I sliced 3/4+ of my thumb off with a knife, sweating, feeling cold and on the verge of passing out. Maybe it's just a low threshold.