Upper, right back pain shoots around to my right side under my arm to my breast?

For the past 2 weeks or so, I have had this horrible pain in the upper, right part of my shoulder/back that wraps around my right side under my arm pit and goes to my right breast. It itches and feels numb when I scratch it and the itch never goes away. It is a constant pain and nothing I do seems to help alleviate the pain. My breast has become so sensitive as well. When I walk and my arm rubs up against it, the only way I can describe it is that the area feels raw. There is nothing at the surface of the skin such as a rash, bumps, etc. It DOES NOT feel like muscle pain. It is sensitive to the touch. It is driving me crazy!!! Any suggestions? I really don't want to have to go to the doctor...