Sore Shoulder In Breast Cancer What's Wrong With Me?!?!?

What's wrong with me?!?!? - sore shoulder in breast cancer

I had chest pains bad, but as his .. closer to my shoulder. I have a pain in the back of my left breast and was always painful for a while? I have heart problems? Breast cancer? I can ice it and wait until going there? if someone has an idea, please help ...