s post may be right on, regarding a pinched
nerve. I Have permanent damage to the C-7
nerve root from an injury, and your
symptoms are very similar to the radiculopathy I suffer from. The nerve feeds through the vertebrae and down into arms and corresponding side of chest.
Although I have this pain 24/7, it is often worse and hypersensitive after awakening. I have to be very careful as to the pillows I use, and the way I support my neck as I sleep.