I had an injury in 2012. While weightlifting I heard a pop in my left shoulder. I cooled it for a couple of days rhen went back to try and lift. After just a few reps I had an overwhelming feeling of fatigue in my left arm mostly in the deltoid area while my right arm was fine. This lasted for 2 years then I finally had a subacromial decompression done in 2014. The left side of my neck is always tight, my shoulder hurts mostly in the front and I still get the feeling of fatigue/weakness. I also have a sudden release of tingling and almost like a guitar string being plucked in my left arm if I use it to pull myself up a stairway. If anyone has experienced this or can offer any help it would be appreciated.