Same here. My flu from hell turned into pneumonia. I finally broke down and went to the doc too. Something I almost never do.
Three weeks from start to finish. Kicked my ass. Yesterday was the first day I felt completely normal.
Luckily I am a teacher and only missed a few days before and after the winter break.
(Sorry to barge in on the thread and whine about my medical maladies. I'm just so happy it's over.)