Sounds like you might be interested in reading a manhwa called “Jungle Juice”.
A bug killer spray called “Jungle Juice” is being sold. After using the spray, they gain a “complex”, which essentially turns them into at a human-bug hybrid with whatever they killed. The main character killed a Golden-ringed Dragonfly.
Had the exact same experience several years back. Was in there for an hour or two. They kept breaking the tooth and had to peel the gum back and drill some jaw bone from what I recall.
Things only ended up getting worse with the flu going around and I ended up bed ridden.