Al, sensitivity to bee stings and food allergies change as you grow older, sometimes a sensitivity goes away once a person reaches puberty then re-emerges later in life. I would recommend that you get a prescription from your MD for Epipens and keep a set at Mayberry, your place in SF and perhaps in your office. Of course that is just my opinion but I would consult a good allergist on this and see what they recommend.
Dinny, next time try marking the mound entry holes with a large object like a stick or something, then return in the late evening when it is cooler. Bees/wasps tend to be less agitated in cooler weather making it easier to sneak up on them and nuke em with poison spray then escape unharmed. You may have inadvertently done the two worst things most likely to put a nest of bees into blitzkrieg mode, attack their home with water just pisses them off, do it on a sunny day just makes it easy for them to find you.