Pain for weeks, pulled muscle? surgery related? shingles?

SAR843

Hi - Three weeks ago I started having this pain in my chest. My very first thought was, oh great, I pulled a muscle. It felt better when I rested, worse when I moved, etc. I saw my onc last week and she said it does sound like a pulled muscle. I saw my surgeon the same day (I had a bilateral mast in Sept. '12) and she said it might be related to the surgery, or the radiation I had after. They scheduled me for a CT and bone scan for next week. The pain has been getting worse. It still feels better when I rest, but it's getting harder and harder to find a comfortable position. It hurt to even lift up a cup of tea yesterday. Yesterday I started to itch, near the underside of my left breast and my back, sort of near my shoulder blade. This morning I started to itch around my chest, heading towards my shoulder. I just finished my treatment and now I'm at the point where I don't know which things to worry about and which things I can just shrug off. I have a big weekend planned but I don't even want to leave my house with the pain I've been in. Any suggestions?