I ve had a variety of upper respiratory illnesses in the last 3 months. I have mild emphysema and asthma, I believe this illness started with Bronchitis. I am currently taking Breo and Levocetirizine. All of my symptoms from asthma and emphysema seem to have subsided. However, I am experiencing a chronic cough that produces clear sputum. Any idea what can cause this?? I did not have this cough several months ago, before the Bronchitis. Thank you in advance, Blessings, Dale Dukes YYYY@YYYY