Pneumonia can kill you, particularly if you have a preexisting illness or any kind of autoimmune disorder. It's also particularly dangerous in---I hate to say this--but the elderly.
That's why they beg older folks to get flu and pneumonia vaccines each year. I've had pneumonia once and I was just 15 at the time and it kicked my ass. It took me a good month to feel like myself again.
Feel better Stevie!