I don't know if it is too late to go to the hospital to get tested for date rape drugs.

I caught a roofie bullet when I was out drinking with a group of girls in college. After a few drinks I was completely out of control and blacked out. I woke up in a bush at a McDonald's in the hood wearing clothes that weren't mine. The next day hangover was similar to the time I drank a liter of Jim Beam just to see if I could (spoiler -- I could. But I paid for it the next day with alternating shits and pukes until nothing but bile was coming from either end).

Do you take a stimulant like Adderall or Concerta by chances? Those can give you the blackout effect while you're still on your feet. It's also possible if you're a bigger guy that the dose was smaller because it was intended for a small woman and not you.

Either way, sounds like you were roofied. I'm not sure if you can still get a medical test done for it but I'd go anyways just in case.