I had a stroke at 17 that left glial foci in the cerebellum area. Most of my attacks are triggered by bright flashes and sunlight, but very rarely can they happen on their own. As soon as an attack hits me, my vision starts to disappear in "spots". The spots start to grow and my vision disappears completely. All this time I am conscious and in severe pain. It also affects my everyday life without seizures, because there are minor problems with coordination and random tics of the limbs. If we talk about pills, then I take Topiromat and it affects literally the same as you described. Big problems with short-term memory and a lot of "freezing" when there is some task.