Definitely have it checked out by a Phyiscal Thearpist. Had the same problem..could not do simply daily lifting without pain and sleeping problems. After visiting PT, he was able to tell me that it was not a RC problem and it was due to the nerves, veins, arteries being pinched by the traps and back musles that pass thur shoulder and attach to the arm. He recommend varies exercises and stretchng that I thought was BS but after about a month the pain was going and very thing back to normal.
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