Shoulder injury

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I injured my shoulder at work last week and am in a pretty good amt of pain. Mostly when I first wake up. Once the arm is moving for a little while I get a little relief except if I raise it too far or extend it too far. The dr seems to think it's just a trap strain but is not ruling out a rotator cuff tear. Has anyone experienced either? This happened a week ago and my shoulder is no better at all.