I have been stung by various bees and hornets but never by a "nasty" wasp. My old man got stung by one the nasty ones on the back of his hand and it swelled up something fierce so he went to the doc. The doc told him to soak it in hot salt water.
About a week later he got a bill in the mail for $8. You shoulda heard THAT phone call.
Oh... the hornets here, maybe they are yellow-jacket wasps?, get very aggresive after the blossoms are done in the fall. They love sweat. Well, my sweat seems to attract them. I have been stung a number of times near the arm pit and once directly in the pit... that one hurt a lot.
But I never cried like a little girl so they must be pretty innocuous.