broken breast bone

Dear All,

I had a car accident on highway and broke my breast bone.
The lateral X-ray shows a dent in the front part of my sternum
and jagged line at the back. I was told that nothing else i can
do except let it heal by itself. I want to consult doctors here
what i should do to take care of myself so i can heal well and
faster. I am also concerned if i could function as before after
healing. I am still pretty young and need a strong bone to
carry me several decades.

I am fine except some short of breath and pain. The doctor
asks me to hug a pillow and cough a few times every day to
keep my lung open.

Any recommendation and suggestion are appreciated. Thanks!