The hands could be cold due to reduced blood supply as in diabetes
, carpal tunnel syndrome, chronic fatigue syndrome, poor sleep, smoking, Raynaud’s phenomenon and pinched cervical spinal nerve.
Since I cannot examine you and know other related conditions you may be having, nor is a detailed history possible on net, I have listed the various possibilities that should be looked into. Please consult your PCP for primary examination followed by proper referral. Take care!