I had a pulmonary trifecta (influenza B, mycoplasma pneumonia and whopping cough identified by antibody blood tests only after the fact) after getting too cold and wet, too many times, sailing a Great Lake in October.

I wish I'd tried massage as that might have helped me heal faster. I do know that years of deep breathing exercises before this helped a lot. The pulmonologist could find no residual scar tissue and the lung function test result was excellent. As an ex-smoker, that was surprising but I thought it confirmed the benefits of yoga exercises designed to use more of our lung capacity than we usually do. There's a lot of good instruction on YouTube to help using more lung capacity. I found some that helped calm cough reflex as well when I was first healing from the trifecta