Another suggestion is visiting a chiropractor. I have had costochondritis (sp??), and what I remember of it (it has now abated), is that when I pressed on my sternum I had extreme pain. But, another thing that I experience which is not FMS related, is my ribs sometimes twist a bit. When I visit the chiro, he patiently manipulates the ribs back a bit and I am fine. When you stated you have pain under the breast, I thought maybe this is what you are experiencing as that is what happens to me. Just a thought.