Hello, I have been having shortness of breath for a while now and i been coughing.?

When I cough there is a pain in my upper back. It is a sharp pain. Also when I sit down for a while my back hurts and the pain is there. I have had asthma since a kid, but I don't think its my asthma each day. It always sounds like I am winded and out of breath. Could this be a lung infection? I had a chest xray done a year ago and a barium swallow 4 weeks ago for a different reason but my lungs looked fine. Could you develop a tumor that fast? I don't smoke at all.