Hi there ~
I understand your concerns. Periductal mastitis
can be an annoying condition to deal with and I am glad you are getting a surgical opinion for this. Having mastectomy
would be curative. I do not believe that your gall stones
have anything to do with the pain, however, Zuska's disease is related to your shoulder blade pain. I wonder if you should seriously consider both surgeries, and a surgeon would be the best person to give an expert opinion.
I hope this helped and I wish you the very best. Take care!