LOL at BigTex...
(I'm a DFW native)...
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KRUSER, you've been accurately informed in above posts. If you didn't have a severe allergic reaction within 0-30 minutes, you'll be fine.
For future reference to all of us....Wasps and/or yellowjackets (that's what KEITHRICHARDS stepped on most likely...they usually build their nests underground) have a non-lethal venom that for most humans will produce an itching that lasts 30-60 minutes and a very modest swelling that may last a few hours while your body detoxes the venom.
It burns pretty hard going in though. When combined with the obvious surprise of being hit by multiple wasps, it can be unsettling.
I am a residential gardener and despite my best efforts to keep an eye out I get popped a couple times a year.
Worst was when I leaned forward into a low palm tree to cut a frond and they had a nest on the backside of that frond.
Half a dozen pops in a split second and one just below my right eye...
OWWWWWWWWWWWWWWWW!...followed of course by much profanity....Eff the wasps! Eff the palm tree! Eff, that hurts! Eff me, because I didn't shake the palm from a distance with a rake first.....