Im an 18 year old female and this just started happening, Ive been having really sharp chest pains up by my collar bones and under my breasts, also in my armpits. Its a really sharp jabbing pain and it even hurts to take a deep breathe sometimes. For the past couple of weeks Ive had a cough but that's gone now. I was just at the doctor the 16th. I was starting to feel better until now. When I move my arms I get really sharp pains and it feels really tight in my chest. Does anyone know what this can be. Im really scared and dont really wanna go back to the doctor. Please help.