Brain Fart in the Sooner State

This last Monday something very creepy happened to me. I had come home from school and was upstairs working on the computer in my office. An hour, or perhaps less, I went back downstairs and sat on the couch in the den. I seemed oddly disoriented and confused. My memory of what I had been doing on the computer seemed strange and unreal. Something bad had happened to me and I still haven't figured out what it was. Because some of the time I was in my office I seemed to be stuporous, my first thought was that I might have been exposed to carbon monoxide, fueled by a faulty furnace. Yet, there are carbon monoxide alarms in my house; they had detected nothing, and seemed in good working order.

Stroke?

Narcolepsy?

Alien abduction?

Spirit possession?

Having happened once, I'm afraid it'll happen again.

What if I'm driving a car when it happens? Or walking down stairs? Or teaching a class?

I hate getting old.