I'd go to a chiropractor and see if he can help before any other Dr. They'll just recommend a pill and rotator cuff surgery like they did to someone I know after a body building related injury. Few years later, rotator cuff pain was alright after not stressing the shoulder and was back to lifting normal weight again.

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Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k