Brachial artery

[Fierce99x]

I was lifting weights like usual but this time my left arm started to feel weird. As I lifted the weights my Brachial artery, I think moved, now it just feels cold. My left arm is cold and Im not sure if this is normal. I dont think its normal since it never happend before but should I go to the emergency room?

http://img149.imageshack.us/img149/314/capturexm3.png