My hands are always cold? Or sweaty?

Sweat is your body's air conditioner, and it keeps you from over heating, unfortunately, some people sweat too much due to a glandular problem, and sorry to say, you are one of them. There is nothing you could do about it, so try to keep them warm by wearing gloves, even light Cotton gloves will help to keep them warm, that is unless you are playing the piano or cello