Last year I discovered the hard way (many thanks to the motorcycle paramedics at Bath who got to me in the middle of the countryside miles from anywhere in only 10 mins!) that I am seriously allergic to wasp stings. I get the full swelling, unconciousness, etc etc. I now carry an Epipen self injector (300mg Adrenaline) everywhere, as well as general antihistamines (not that they will do much good other than slow my reaction down a tad, apparently). I also have a tasteful medic alert bracelet. Better safe than sorry, esp. this time of year :o(