Crackling

I keep forgetting to write about the fact that when I breathe, I hear crackling in my chest. I have told Dr. Sherman about it and he dismisses it in many ways. He listens to my chest with the stethoscope and says he hears nothing, he checks my neck and feels nothing, he checks my ears and throat and says he see nothing, and then tells me I may have caught a virus or something. But I have been coughing (dry coughs) for the last two months and I can hear myself rale when I breathe. What gives?