Thanks for your question on Healthcare Magic. I can understand your concern. Possibility of lung disease is very less because you are having normal chest x ray. Better to get done PFT (Pulmonary Function Test) to rule out any functional lung disease. If PFT is also normal then no need to worry for any lung related diseases. Sometimes undiagnosed stress and anxiety can also cause similar kind of feelings. So avoid stress and tension, be relax and calm. Don t pay much attention to such things. Don t worry, you will be alright. Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.