Replying to So Yesterday

I went out with friends to a big festival. I was drunk, but not too much. And now comes the strange part: After aprox. 1 AM i remember nothing, total blackout. The last thing i remember after the festival is that i was on a street (alone) at 3 am, than i went back to the festival but no one was there. I was alone so i walked to a freinds house, but he didnt open... Than i waited until 6 am and called my mother to bring me home.
I think someone gave me drugs (maybe roofies, they last 2 hours). I checked my phone and my wallet, everything fine there.
oh yeah and today i puked, this is strange because i never puke the day after and i wasnt too drunk. pretty cool story.

inb4 rape(i dont think so, pretty unlikely)