i have been having problems breathing as well and chest pains i have no idea what it is yet and i am a smoker at 22yrs old. i would take him into a doctor asap sincei have to wait 2-3 weeks to get in and im worried keep me updated on what he has!!
I would start with your pediatrician and see what they say, otherwise go straight to the pulmonolgist. I wouldn't wait too long...not to scare you but the sudden onset of things always worries me,personally