Had a very similar experience unintentionally. A coworker was making mixed drinks with Everclear, which was 190 proof (95% alcohol). I badly misjudged how much I was drinking, and it was one of three times in my life I threw up from drinking (probably saved me from alcohol poisoning). Took me a few days to recover fully. Before that incident, my preferred drink was whiskey neat and I could drink it like water. Ever since, any hard spirits make me nauseous immediately if they aren't mixed and diluted heavily. I figure it's my body's defense mechanism telling me not to drink poison anymore.
