Had 3 drinks over 3 hours and blacked out???

I’m hungover now. I had 2 coronitas, tiny little beers, with dinner. A couple hours later I went out and had an espresso martini. I hung out at the bar for like 30 minutes after having my drink then went home. I remember starting to walk home, do not remember getting home. I woke up now like 16 hours later with my damn shoes on, hungover as if I was clubbing. What the hell???! Nobody spiked me, I drank that drink as the first patron with only very nice staff around. I left when people started coming in. I guess I’m less asking for advice more just complaining. Has this happened to anybody?