what kind of doctor do I see for pain in my chest 5 years after breast surgery?

Five years ago I had breast reduction surgery and have had pain on my left side under my breast ever since. At first it was quite severe and my primary care physician said it was ” just nerve damage not to worry it will go away”. Now five years later it is still there but not as severe. However, when I do anything that involves really using that muscle ; I get sharp pains across my chest and cannot use my arm or the pain is too great. It’s affecting my ability to perform my job and I have to do something.