I've had it quite badly, was hospitalized with it twice. I also have lupus so I weaken fast, but it is nothing to play on its own with either. Left untreated you can tear/rupture a lung (like I did). Also there are times when one medication doesn't do the trick and you may have to try another one or a second cycle. Believe it or not there are such things as lung pysical therapy also if you have trouble recovering. It hurts, you don't want to go there.

Did they do xrays? Did they take a culture? Are you coughing up mucus?

Listen to your body!