I Have Had A Collection Of Upper Respiratory Infections This

I have had a collection of upper respiratory infections this season. Allergies and a treated bacterial, hay toned discharge, and what I assume is some viral cold/s. I seem to have the upper respiratory infections under control but have had to sleep sitting or I get rales and the strain on the ribcage is excessive. The coughing produces clear or frothy mucus. Outside of a steamy environment, what can I do to clear the lungs?