I had injury in left shoulder 3 years ago, that time i did not treat it with doctor, as the pain went away in few days, from that time i feel a little problem in moving the shoulder. a little bump of bone is also appearing on the shoulder. As earlier i did not noticed it. Now sometimes when i do something which involves fastluy moving hands  like play badminton, there is also dislocation type stretch in my joint of left shoulder. then there is pain after thatm What should i do now?