I got initiated into the "Bicyclists who have been stung while riding" club this past July 4th when a bee got trapped under the strap of my helmet. I still insist that I set a world record in coming to a stop and peeling off my helmet, but alas, the little sucker still had time to sting me. I then compounded the problem by not immediately halting my ride and seeking first aid, but instead finishing my ride. By the time I got home the site of the sting had started to swell, and eventually I developed a welt the size of a golf ball on the side of my face. It took two days for the swelling to go down.

I can only imagine how much worse it is to get stung inside of one's mouth. Getting stung on the tongue on in the throat poses an immediate, urgent danger, because any swelling can potentially block the airway. I am glad the OP did not suffer too much of a problem.