It was bad. i was down for 4 solid day’s with an aggressive H1N1 and wondered if I would even wake up next time I fell asleep. A few more days after to to feel like I was over the illness, but it took months to completely recover my physical stamina. Before the illness I was jogging 3 miles every other day. After the illness, I Couldn’t even jog a quarter mile 2 weeks after... I stopped trying for a month, and it was very slow at coming back after that, I HAVE HAD A FLU SHOT EVERY YEAR SINCE.