I recently had breast and lymph node biopsies. They had to repeat the lymph node biopsy and on the second one I think they caught a nerve as I had a sharp pain go all the way down my arm. Ever since I have had constant pain, what feels like something snapping in my upper arm if I lift it up and pins and needles going all the way to the tips of my fingers. Is it possible to get cording from this even though it was a standard biopsy and not a sentinel node biopsy? The GP has prescribed gabapentin to see if this helps. I’m due to have a mastectomy in a few weeks as well. Any other tips on how to control the pain would be greatly appreciated.