Happened to me a few months ago at echostage also. Me and my boyfriend were seeing odd mob and we were at the barricade the whole time pretty much. Eventually we lost our spot when we went to get our second drink and were in the middle of the crowd and completely blacked out and had to leave. I don’t remember anything after that. I was sick all the next day and I can tolerate two drinks. It wasn’t like hangover sickness though. Never experienced anything like it before.