I have lung problems and would like to know whether anyone has any idea what it could be.?

I have been having lung problems since I was 13 and got run over by an Isuzu Trooper SUV. It ran over my leg, back and grazed my head. I have been to many doctors to try and figure out what is wrong with my lungs because I often cough up blood, but no doctors that i have been to have been able to tell me what is wrong with me. Anyone have any Advice? I am currently 20, 5f 8i, and 130 lbs with a fit body. (if you have any idea please leave a response and rate this as interesting) WILL GIVE 10 POINTS!