I had been suffered with similar symptom since beginning of this year. In the beginning, I tried acupuncture and wasted time and money. In the middle of summer, I had MRI on my shoulder and which came back negative result. I then had two cortisone shots on my R shoulder earlier which did not WORK.... My physician didn't even believe my complain. Last month, I had MRI on my spine and neck and found out moderate herniation from cervical 3-7. If you have mild headache in the morning and un-explainable pain on your shoulder and arm, have MRI on your cervical.