I have been reading all of your stories and have a question for those of you that have primary lung cancer....I have had a dry cough for 2 weeks now. It is the kind that you get the first day of a respiratory infection where your chest feels tight and you just keep feeling like you need to cough. Usually it develops into a more productive cough, but mine has not. I called me DR on Thursday and he gave me a Z-pack, but so far it has not helped. Next step is a chest x-ray on Monday. I am freaking out over this. Do I have a reason to be concerned in your experiences?