Same thing happened to me couple months ago!
Had a Diet Coke with ice in mug while outside working, ice had pretty much melted, and bumble bee kept buzzing my drink. Finally, wasn't paying attention, took a big gulp; I felt something go down; thought it was a small piece of ice.....then the pain kicked in!!!!!!!!! Honestly thought I was having a heart attack! Pain, PAIN!!! Pain was down into my chest, difficulty breathing; pain; light headed; more pain; nausea; even more pain; couldn't make it into the house, had to lay down in the grass, did I mention pain? Guessing about fifteen minutes, seemed like hours, I attempted to get up and try the twenty feet to the house- couldn't make it! Finally got inside, for approx. two hours, I would get spasms, gradually less painful, and less intense.
Learned me to:
(1) Take a GOOD look in my drink before.
(2) Guard the area around my drink better than airspace above 1600 Pennsylvania Ave.
On another note, friend who supervises clearing and maintenance of their pipeline right of ways, stated that for ground hornets, a long joint of 2" PVC pipe, and can of gas is standard equipment with their crews; work the pipe to the hole, lift, and begin pouring. Two "bodyguards" with a can of wasp spray in each hand are positioned near the pipe holder and pour guy. Safety man was against use of gas until he saw a sting victim en route to hospital. Now he turns the other way.
You are a lucky man! A sting to the inside of the throat can be fatal
I had a yellow jacket get inside my beer can one time. Thank goodness I filtered the next drink thru my teeth, but the yellow jacket still managed to lodge between my upper lip and gum. I killed it by smashing it between the two. Looked like Frankenstein for the next couple of days