I'm really sensitive to the cold, basically when everyone else is hot and sweating I'm comfortable, and I'm freezing any other time.

I don't know what the cause is. But I've had some scary experiences with it... my hands will feel painful and burning or numb and clammy, thawing out is especially painful. And while its going on I will get nauseous and lightheaded. One time I even briefly blacked out - my vision, hearing, and sense of touch all faded away though I was still conscious.

I've tried to research this online and I can't find anything about nausea and blacking out being associated with being extremely cold. Does anybody know what this might be?