On Friday night, March 13, as I was leisurely handshaking my way out of a goodbye party for a friend, I grabbed a couple of macadamia nuts out of a dish to munch. A few minutes later, I noticed that the gums surrounding my right upper molars were starting to swell. And, before I got to the lift, the swelling, in an odd trajectory, had travelled around my whole mouth to the left and my tongue had started to swell as well.