Hi I'm a 42 year old female. I'm getting intermittent sharp pain in my right breast whenever I stretch forward and down at a specific angle. It stops me in my tracks. This has been intermittent for about 12-18 months. Doc said I'd probably pulled a muscle but I haven't been doing anything to have caused this. I've now recently been getting a dull pain/tightness feeling in my chest centrally ? Sternum. Should I be worried? Thanks