I injured my left shoulder about three years ago lifting cabinets overhead. I was told the joint is very narrow in my case and the bursa was swollen causing pain at that time I thought I had torn my rotator cuff). About 2 weeks ago I was pulling with my arm extended and slightly behind me and I felt a twinge of pain. Since then ithas progressivly gotten worse. I now experience pain under my collar bone right where my neck is and sometimes like a nail is being driven straight into my shoulder.I also have aching in my bicep with tingling sensation that radiates down to my thumb and adjacent finger.