I'm not an expert on this... but it sounds like just an over-use of NEW golf muscles. Your body is not used to this new pattern , and you worked on it pretty hard in a fairly short time period.
Probably should take a rest from the Hitting for a while, until the inflammation in the shoulder goes away. When you are healed, come up with a stretching, and strength building routine, that is good for your HITTING pattern. With HITTING, THERE IS MORE PHYSICAL EFFORT INVOLVED THAN WITH SWINGING, so you might have to prepare your muscles and tendons, for this new activity.
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