I had the same experience a couple of years ago after I dislocated my left shoulder and broke my humerus in a strange accident at the gym. In an process of relocating my shoulder and the incidental nerve stretching of the injury, I think the muscles/tendons were stretched and traumatized. I had a lot of sleep disturbance from this injury because I couldn't sleep in my normal position and of course the nerve pain was sometimes excruciating. Sleep deprivation and anxiety will absolutely create the "symptoms" that you have described, at least I felt the same sensations. I could feel every beat pounding in my chest at night! Doctors often underestimate what sleep depravation can do to a person--mentally and physically! My neurologist finally ordered Amitriptyline for the nerve pain (off label use) and I finally got relief with only 10 mg at night!