I am playing long gigs with my band (6-7 hours long, once/twice a week) and a lot of movement is involved in making a show, also I am constantly "dancing" with the rhythm while playing. Also note that I am playing an electric guitar, standing.
After each gig, I experience a sharp pain above my left blade, right next to my spine. This spot gets painful sometimes with carrying heavy loads as well, and in case of electric guitar all the weight is held just above this spot, on the shoulder, so it doesn't help.
Any of you have any experience with this? Any ideas how to not let this thing get unnecessarily worse? Any exercises that might ideally resolve the issue?
EDIT: Carrying heavy weights is not the right way to put it. It is not an acute kind of pain, it is more chronic, so for example when I carry around a backpack for extended amounts of time, then I feel it.