Quote (ms madness): "the getting older bargain" - WHAT?
LOL - Did I fail to read this in the fine print?

EH, it does sound very much like a pulled muscle. I have the urge to agree with Hannelore. Can you find the meridians traveling through the point of your pain and have your hubby do some accupressure on the appropriate points, if you can't reach them?
It could be a referred pain (never heard of it in a chest muscle, but I haven't heard everything, for sure). Can you better describe the pain... is it sharp, dull, shocking, pulsing, etc.? Can you better describe it's location?