After the seizure was over and I regained motor control, I tried twice to write something like "Sorry, guys, I was having a seizure for the last few minutes, could you summarize for me what you discussed in the last few minutes?", but I wasn't able to get past the first five words either time, because I was having trouble connecting thoughts to words.
I called home on the Webcam a few minutes later, and managed to get the right words out to Mom and Dad, communicating what had happened. About an hour after the seizure started I called again, and had recovered my fluency.
The most likely cause for the seizure is that I only had about seven hours of sleep the night before. Last night I slept from about 10 to 8:30, so I am not afraid today (but I'm still being cautious!), and tonight I'll go to bed at about 9.
One positive thing I can think of about this is that I might be able to make a good presentation about it in Intro to Psychology, where we have just been studying what parts of the brain have what functions. I would find fun attaching each function I had trouble with to the part of my brain that was having trouble.