I'm not a doctor nor do I pretend to be(or play one on TV). Could be something called "frozen shoulder". I've had this in both shoulders and it sucks.
First off, go see your doctor. If it is this, you're going to be doing some exercises for awhile. The only way I finally got past it was standing in front of a wall and walking my hands up it. That and doing exercises to strengthen it.
Good luck and keep us posted.
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