Hey Rebecca, I was just wondering if you got a diagnosis? I actually have had pain and burning in the left shoulder. I found out it was a rotator cuff injury, apparently a double tear, because my physical therapist said he wasn’t sure how to treat it completely. So I went through 6 weeks of therapy for one aspect, but they couldn’t do strength training (as they usually do, once they’ve worked out the pain issues) because he feared inflaming the other part of the injury. I know this is from years of playing violin. I’m approaching 60 and these ‘repeated motion’ injuries are pretty common. For a young person, though, I would be concerned about how you hold the violin if it is a rotator cuff injury. Let us know what’s up, if you can!