Aches Behind My Right Breast

I m having pains behind my right breast.It seems that when I take Deep breaths and make sudden movevements It hurts more and very painfully.I can barely move.I m having these issues for the last 2 weeks.At the very beggining I had aches at my belly,than it switched upon my neck and the left shoulder at the same time.I couldn t move,rotate my neck for 2-3 days.After that the same pain moved behind of my right breast.THe pain keeps moving and moving around my body and I really don t know which part of my body will be next. I even consulted a doctor but he said It s nothing serious and It ll be gone within a couple of days,but It really hurts and I can barely move and it just doesn t feel right to just stay and wait . can u tell me the reason of these issues and what to do. thanks