New pins and needles nerve pain

ACK!!!  6 months after extensive shoulder surgery, a few days ago I started having nerve pain going down  the back of my arm, through my elbow, the back of my  forearm and eventually my whole hand is numb and  tingly.   Also, a month ago, I developed this odd rash on my back of my shoulder blade.  The dermatologist said it is irritated nerves that is causing it.  Asked if I had recent surgery.  She thinks the whole  thing is connected but of course this is way out of her expertise.   Anyone else have this happen?  I know I need to go back to the surgeon, but I'm scared of what he will say.  I don't think I can  handle anything else at this time in my life.