i'm a fitness trainer,almost 3 weeks i feel the pain in my bone under my left breast,specialy when i take a breath,I'm realy afraid for what i feel coz,even i will put my hands (left) up,coughing,crunches and lying on my bed it more pain,its hard for me to move,,i've been to the doctor twice for check up and they told me it's only a muscle pain and because of the weather.And now seriously i am more scared coz i feel the pain going up on my breast,and i want to know what kind of sickness is this?hoping that i will recieve an answer about my situation,thank you.