I have to comment on this, seeing as both parts are somewhat right up my alley… :nerd
Yellow jackets are not really bees, at least not honeybees…different evolutionary history…and quite a big difference in them…but some similarities as well, i.e., parallel evolution.
Apis mellifera (the most common found in N.America), from the Apidae family including honeybees, carpenter bees, and bumblebees, are actually relatively passive, unless you do something to them, such as disturb the hive (also, low level increases in CO2, some perfumes and other scented products, high humidity days sometimes)…they sting once, and die…simultaneously, the sting also releases a pheromone for others to respond to, so after first sting, get away from there…they have tremendous value though, including pollinization, honey and wax production, etc…
Yellow jackets are from the Subfamily Vespoidea, Genus Vespula, and are part of the social wasps…they can be highly aggressive, and are capable of repeated stings per individual…read, they are mean little suckers…but they too have value, as they kill catepillars who in turn due tremendous damage to crops…they are agitated from similar reasons to honeybees, but react much more so, especially to invasions of the hive…
Neither if these is to be mistaken for the Africanized hybrid bees…note I did use the term the press loves to use, “killer bees”…they do not exist, except maybe in some grade B movie…a subspecies of A.mellifera, A.m.scutellata (also called A.m.adansonii) can be very aggressive, especially when provoked, or swarming…I doubt many of you have ever seen a true swarm, defined as 20,000+ bees (be honest now, 100 flying bees around your head can be unnerving, 20k bees is incredibly loud, and is roughly a cubic meter, packed no space, worth of them)…I did research in bees for 2 years, and only saw a few, and I was actively looking for them, and have walked within 10 feet without problems…most of the attributed deaths are/were small children, or elderly who have medical histories of cardiac, pulmonary/respiratory, and or renal problems, who did something stupid like walk right up the the swarm resting on a tree and sprayed it with a can of insecticide or a hose…the Alfred Hitchcock image of swarms miles wide swooping down from the skies and killing the townsfolk are only scenes from a really bad science fiction film, or a journalist trying to sell newspapers…
I do not know the individual who was stung repeatedly, but i suspect an underlying history of cardiac problems, whether known by the individual or not…anxiety in a short time frame can hardly initiate a myocardial infarct, at least not without everything lese already set in place, ie CAD, previous MI, ASHD, etc…we all experiance occasional bouts of very high anxiety, we all dont get MI from them…lets not get into a long discussion on this, I am sure some cardiologist, or entomologist, or phrenologist will disagree with me here…
The benadryl suggestion is an excellant one, so is an epi-pen for some, though the dosage only gives you about 5-8 minutes window to seek definitive care…best advice is don’'t ever swat at bees, yellow jackets, etc., just keep moving…they can fly at approx. 5mph, a brisk walk or light jog is sufficient to get out of there…
If you are being attacked by multiple bees or yellow jackets or wasps or any number of insects, drop the pack and run…fast!!! You can always go back for your pack later, they will invariably clam down…If you are being stung alot and somewhere in that terror filled feeling you begin to smell a slight banana smell, your dead…just joking!! actually, the pheromone does smell something like bananas at high enough doses, but that is a good time to get out of there, really fast…
OK, I am done spouting off, maybe a tiny piece of this helps somebody out there, or at least clears up some misunderstandings… :tongue
-xtn (the real one) 
airferret