I got drugged once and I know there is more than one type of drug to take advantage of someone, when it happened to me I had 2 drinks at dinner, we walked back to the car but my wife had to use the restroom so we stopped in a bar, I grabbed another beer because of the long line in the bathroom, drank the beer and by the time she got out I went from (almost) completely sober to black out passing out drunk, over the course of maybe 15 minutes, not even enough time for the beer to hit. I say all of that to say this, I had the worst hangover of my life the next day, couldn’t open my eyes or move kind of hangover, but you could have been dosed with something else