Rich

I feel your pain Rich, literally, having had the same issue about ten years ago.  Hope you get it sorted soon.

I had a bout of this in 2019, nothing the physio did sempt to improve the situation and the exercises didn't help a great deal.  As I'm allergic to Ibuprofen I couldn't take advantage of anti inflamatories either.  Thought I was going to have to say goodbye to bass playing with a strap.  As the gig list was a bit depleted last year for some reason, the shoulder seems to have settled and is now pain free.  Hope you get lucky Rich

One of the worst areas in the body to damage, the rotator cuff muscles and associated tendons/ligaments.