Shoulder and upper arm pain?

I have been suffering severe upper arm pain since Feb. of this year and it just gets worse! I have been to the ER and the doctor. My x-rays are clean. I would like to know if anyone out there has had this problem. The pain started in my upper arm right below the shoulder it radiates into the shoulder and into my collar bone. I cannot move it up or down or in or out. As long as my arm is close to my body and bent at the elbow its seems ok, but just sitting here typing on my laptop my arm feels like its coming out of the socket! Please reply only if you have had this problem!