I've been stung by a few Australian species. None have been all that bad, localised itching and stinging for between five and 20 minutes, in a couple of cases there has been very (very) slight numbness or stinging for another hour or two.
I heard of a guy training with the army in central Australia who was stung by a Urodacus yaschenkoi, I think it was in the 90's. He took a day off training, but I think he was just taking advantage of having a plausible excuse!
I handed a wild scorpion in Texas recently, being unfamiliar with the local species I was a lot more careful than I am with ours! I was with one of the world's most experienced snake keepers at the time, and I expected her to think nothing of it, but she freaked right out! :lol: Over there they get them running around on the walls of the house, especially just before rain, much like our huntsman spiders.