We kinda know what happens if you get sucked into a black hole because of math (spaghettification, what outside observers would see, etc); can the same be said about worm holes? Would you even notice if you passed through one? What would they look like? What would someone watching someone else go through a wormhole look like?
Sounds like it’d be faster than the nervous system could process pain?
That depends on the specifics of the black hole you are falling into. It could be over in the blink of an eye, or it could be like one of those medieval torture machines. The main difference being the mass: a smaller black hole would kill you faster.