your last post was "it's hard for you to breath"
now your saying that the doctor said your chest is okay.
doctor's dont know everything, so dont put all your trust in your doctor. i found more info out on the internet.
the next time it's hard for you to breath call 911 & tell them, they will bring out the firefighters and EMT would will drive you to the hospital.
this is a serious thing. it upsets me to hear that your doctor would just check your chest and send you on your way.
you have to take matters into your own hands because my doctor ignores me, so i call alot, i do what ever it takes to get his attention.
after you go to the hospital, call your doctor and tell him.
he should be doing tests on you to rule things out.