What Causes Cracking Noise In Lungs While Laughing And Cough While Breathing?

I swallowed a pill and it went down the wrong way. I was checked and had no infection but a small amount fluid in one lung. i went on vacation an could not stop coughing and yesterday we notice that it crackles in my lungs with a breathe in when coughing then i started getting very short of breath occasionally during the day plus very little appetite. I do have moderate COPD and am on Advair and i ve have not had any issues We decided to leave our amazing 14 day vacation and come home. I am seeing my physician tomorrow.