What kind of shoulder injury might I have?

Hey everyone. For over a month now, I have had a shoulder injury from repeated shrugging of my shoulders which was caused by a medicine. Apparently I had a rare reaction to Zoloft which caused me to repeatedly and involuntarily shrug my shoulders. This has resulted in an injury to my right shoulder. It hurts in my arm pit, on the top of my shoulder, on the top of my arm, and behind my shoulder blade. Also, sometimes the pain shoots down to my elbow. I don't really have any difficulty in raising my arm above my head. However, putting pressure on my arm causes immense pain and so does various movements. What might be the problem?
 
I just got back from the emergency room. I had to go because the pain was so severe. Well, they took a few x-rays but didn't find anything wrong. They also gave me an anti-inflammatory shot and a prescription for Tramadol which is supposed to be a pretty powerful pain reliever. They also told me to use ice on the painful area for 48 hours and then after that I could use heat.
 
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