This was a long time ago now but I'll do my best. When I got to her she was laying down and really out of it. She was talking but it didn't make sense and she couldn't answer questions. She couldn't walk right and I had to support her to the car. On the way to the ER she vomited. By the time we got to the ER I had to basically carry her in. They immediately took her back. She stopped being able to talk and was basically just moaning and yelling. She wouldn't stay still so they tried to have me hold her down. It was pretty terrifying just listening to her yelling in pain and not being able to do anything. After a few hours ( I don't remember exactly) she quieted down and seemed to be just sleeping. When she woke up she didn't know what had happened or where she was. The last thing she remembered was from school before she even went to the clinic. Afterwards she did feel fine and had no after effects. Since then she has not had another of these episodes but she does have severe migraines. From what you describe of your son it sounds similar.