To get rid of clammy hands, you could wash your hands and then rub them with lotion or hand sanitizer. Just getting them wet with warm water (not hot!) should help. Stay out of extreme hot or cold weather and wear "breatheable" gloves.
I heard laser treatment is offered for this condition. I heard, sometimes, this condition has to do with anxiety. Also, I noticed if I drink alot of caffiene, I get sweaty palms. Diet changes can help. Good luck.