Not necessarily amnesia, but I have epilepsy and can kind of add a comment to this, though it may get buried.
Coming to from a seizure, especially my first one, they always ask you a bunch of questions. So I've got two paramedics standing over me, I remember my sister crying in the doorway, my father standing behind the paramedics. They asked me my name, which I did know that, and was dumbfounded that they would think I didn't know my name. They asked me the date, I said I didn't know, but that I wouldn't know that even if I hadn't had a seizure. Then came the questions that really started to mess with me, and it still puzzles me when I think back on it, and on the other times I've had seizures. They asked me where I went to school, I had just transferred from a small college in NC to a community college in TX, but I could not remember where I went to school. I told them that I go to the school in NC, but that I also felt like that was wrong. I started to panic because it was like there was this massive blank gap in my memory spanning months. I could remember things like my name and stuff, and my father's name, but I didn't know where I lived, who the president was, where I went to school, etc. It's just a blank gap. During the time where they asked the questions, it's hard to describe, but the panic was so terrifying, just having absolutely no idea what's going on. I think I could maybe describe it as having something right on the tip of your tongue, but adding an insane amount of fear that you just don't know the answer.
Another strange thing with the seizures is that I have absolutely no memory from 2-3 hours prior to the seizure and about 30 minutes-1 hour after the seizure. One of them, I apparently had an aura and knew it was coming, because my room was completely tidy and ready: my guitar cables and pedals were all placed neatly under the bed, my books were all put away, and there were a few other things I had done, but I don't remember any of it.
I know this isn't amnesia, per say, but I thought it may be relevant.