I got bit on the foot by a northern pike once.
I'd be much more worried about leeches or guinae worms depending on where I was
guinea worms are a parasite usually contracted from ingesting the larvae in contaminated water. once inside the body the larvae make their way into the abdominal cavity to grow and mate. once finished mating the male worms die and the females start burrowing around inside you, sometimes it can grow up to 3 feet long and can end up in your eye, organs, etcetera etcetera. when the worm is ready to lay its eggs it will burrow near the surface of the skin and creates a blister as well as starts producing hydrochloric acid. this obviously hurts like a bitch and most people try to relieve the burning sensation by submerging the area in water, which is what the worm wants so it can lay its larvae and start the cycle over agin. interestingly enough the medical symbol of a snake wrapped around a stick is based off the folk treatment of a guinea worm infection for obvious reasons. if the worm is sticking out of a popped blister just start slowly wrapping it around a stick to pull it out.
now I'mma stop before I pass out. not many things make me squeamish, but parasites sure as fuck do. cold clammy hands and tingling in the extremities usually isn't a good sign