My daughter had walking pneumonia earlier this year overall not a big deal, she bounced back, a few months later she got full blown pneumonia, spent a day at the hospital to clear it up with antibiotics but also they had her do a breathing exercise to help her recover basically making a pin wheel spin with a large breath. Doing that a few times an hour was supposed to help get air into the part of the lung that the pneumonia was blocking up. So consider doing breathing exercises.