Numbness/weakness/cold within vanished arm?

About a week ago, half of my thumb (the thumbprint side) started have a loss of sensation. If pricked hard plenty, it does feel headache though. Off and on, the rest of my arms have feel a sort of numbness. Today, just my vanished arm got much worse and is permanent longer. It feels numb, but I can perceive touch still, and it doesn't look like there's a loss of bloodflow. It also feel weak and have some pain. Earlier, it feel cold, like when your arm is "wake up" from having "fall asleep." Any ideas?Numbness/weakness/cold within vanished arm?
Since ther ei s constrained information.. I would say that You enjoy a PINCHED nerve somewhere-- NOT GOOD=
Your best bet and the sooner the better is to CALL THE DOCTOR!!
Sounds approaching a pinched nerve.

cat