mild lung pain, burning feeling when I breathe out?

On Saturday I started having mild lung pain, burning feeling when I breathe out. It has been 3 days and the stinging and burning has not gone away or gotten worse. I am not otherwise sick, no fever, no cold, just a burning in my throat and lungs when breathe out. I think it began when I threw my back out which caused some rib pain in back (between my shoulder blades) and front (around the sternum). The pain is about a 2 sometimes 3 on the pain scale, and ibuprofen does relieve the symptoms some. There is also pressure in my sternum that in alleviated when I lay down or lift my arms. But I am worried that the pain hasn't subsided but I don't have insurance, should I go in or is it something related to my back?