Could Cold With Clear Phelgm And Shortness Of Breath Indicate Lung Cancer?

I would like to know if you have a cold including a clear flime accompanied a shortness of breath when you walk about 1 block sine 2011, it could be lung cancer. Even you seeing Doctor's they said allergies or asthma. You get medication noose spray and sometimes your nose itch and throat dried. They made chest caskin and X-ray and everything shows normal. Nothing is wrong but you still have the same symptoms. Can I have a clear explanation and Also acid reflux desease.