Sounds like Flowers for Algernon.
"Understand" by Ted Chiang is one of my favorite sci-fi-adjacent short stories. It's about an experimental drug causing uncontrolled exponential growth of human intelligence, told in the first person. One of the most mindblowing works of fiction I've ever read. There's a great reading of it on YouTube, well worth a listen if you have a spare 2 hours and you like this sort of thing. https://www.youtube.com/watch?v=RxG2K3nTiJE #grownostr
Discussion
Yeah, it’s in that vein but as a short story and taken to more of an extreme