Was I drugged by someone at the bar and what was their motive?

I was drinking with a friend and had only ONE drink the entire night. We had food before we drank and we made sure to drink lots of water. I didn't take any medications that could possibly cause this reaction. After a few sips of my drink and maybe 15 minutes into drinking it, I lost total consciousness. I started having blind spots/spotty vision, was so dizzy and my hearing was going away. I couldn't stand up so I just stayed sitting and I almost stopped hearing and seeing what was going on around me. I just put my head down and prayed the feeling would pass. It was so terrifying and I really have a hard time believing that I got drunk off of ONE drink.

It really disturbed me and my friend quickly paid for the drinks when she saw what state I was in and after maybe 20 minutes the feeling went away and I slowly stood and up and began feeling more steady on my feet. Was I drugged? It was the most scary moment and I felt like I was out of my own body and it was so disturbing. Someone explain what happened. But if I was drugged, what was the motive? Because I do have gaps in my memory but I know it was not for sexual reasons because I just went home after recovering and no one tried anything inappropriate with me. Why would it happen then, if not for sexual reasons? I'm still shaken up from that and feel so upset that I was so out of control with my own body and mind. As far as I know, there wasn't an opportunity for anyone to tamper with my drink unless it was the bartender himself... Has this ever happened to anyone and why? It disgusts me that someone would tamper with another person's drink for their own sick amusement or whatever ulterior motives they have.

Was I drugged by someone at the bar and what was their motive?
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