does anyone know what this is? i get this sharp shooting pain of the nerves when i raise my arm above a certain point or move it in a certain direction. the pain seems to originate where the upper arm meets the shoulder. i started to get shooting pains after playing more tennis than i usually do, a couple weeks ago. interestingly, the pain isn't there when i play tennis, it only comes back when i am done. does this sound like a rotator cuff issue? and would this be alleviated to by switching to a lighter and more flexible racquet? my current racquet is almost 13 oz. and has a 72 stiffness rating and i am thinking that is the culprit.