I have had a cough and chest congestion since Feb. 26, 2015. I ve had a chest x-ray, everything ok there. I ve have two antibiotics, z pak and cylodexcline something or another, and a allergy shot. Still congestion. And promethazine-codn for the cough. Pflem is clear, when there is any. So tired of the rattling in the chest. Cough has eased up, but still pflem. Whats left to do?