Did someone try to drug me?

Luckily, I still remember enough to know that nothing happened, but last night I was at a bar alone trying to clear my head, and I had three drinks between 11:00pm-2:00am, but I ended up feeling REALLY drunk. Like, the room was spinning, and I had difficulty standing up straight drunk. There was only one point where anything could have happened, where I left my drink covered to go use the restroom, but I asked the bar tender to watch it. (maybe they were the one who did it, or they didn't really watch it?). I managed to get home just fine, but I didn't stop feeling drunk until early this morning, and now I feel wickedly hung over.

Does anyone else know what those kinds of drugs feel like, or if there's a way to test my system?