I Was Diagnosed With Pneumonia Yesterday. I Was Given A

I was diagnosed with pneumonia yesterday. I was given a prednisone shot a zpack and cough medicine with codine in it and an expectorant in it. I am still feeling really bad with a lot of lower chest pain and I am not able to cough any thing up. My Sp02 is still at around 96%. What is the best way to get the mucus up out of my lungs?