Yesterday an abrupt pain started in my left arm centralized in my upper arm. It's hurts most on the outside of my upper arm and in a few fingers. The pain in above moderate and below extreme. I'm 18 and a smoker. I know the risks but have been addicted for 5 years. I am semi worried this might be a heart attack or stroke. I'm fairly sure it's something else though considering how long I've been feeling it for. It hurts especially when I raise my arm up. The pain sort of radiates up and down my side but it's very dull. Could this be a piched nerve? Or could it be caused by anxiety? Possibly something wrong with a disk? Any help on this matter would be greatly appreciated!!