It sounds like you had a very severe case of pneumonia. I'm glad to hear that your lungs have recovered. Your question about the post-infectious fatigue is tough to answer. Most people that have a severe infection experience fatigue that lingers after the infection is gone. The time period varies greatly from a few days after the infection is cleared, up to a few months. In some rare case, the fatigue never goes away and patients end up getting diagnosed with chronic fatigue syndrome (please don't worry
about this right now).
I suggest that you schedule an appointment with your primary care physician
in about 1-2 months (total 2-3 months from pneumonia) if you are not completely back to normal by then. An earlier appointment would be fine as well, but the earlier you see your doctor
, the more likely he or she will want to wait and see. In the mean time, try to keep as normal of a schedule as possible. Make sure you are sleeping 7-8 hours every night. Try improving your diet to include mostly fruits and vegetables and make sure to get 20-30 minutes of exercise daily. All of these things together should help you shake the fatigue faster.