I went to the doctor with severe aches and pains (flu like) last week. As my regular flu symtoms subsided, I started to feel pain in the middle/right side of my chest. This pain is slowly spreading exclusively to the right side of my body. It is particularly strong in the right side of my neck, clavicle, shoulder area. It is painful to take deep breaths. It is strong enough now that it is keeping me up tonite. Im tempted to go to the ER as it definitely feels like its circulatory in nature.... The pain is sort of throbbing in nature, and I am experiencing a general weakness in my shoulder/arm.