I got it last year during fall semester. I started feeling a bit bad on Wed, felt worse Thursday, and I went to bed early that night, which I never do. I did watch Resident Evil on youtube that night thought. That detail is relevant because I had fever dreams and thought there were zombies in my basement. I woke up at 2:30 in the morning, my bed soaked with sweat and I was almost hallucinating. I thought I was Ender from Ender's Game and I thought I'd blown up Earth and I was the only person left alive in the whole universe. What was weirder was that I thought the war in space was between Apple and Windows... It took me a few minutes to crawl across the hall to the bathroom and haul myself up to the sink to drink some water. I dragged myself upstairs the next morning (Friday) because we were having a new floor put in or something, but it hurt too much to be awake, so I went back to sleep. I think I woke up Saturday sometime, then. At any rate, I slept for 30 of a possible 36 hours, and went back to school on Monday.
It hit me so fast, and left almost as quickly.