Ok, I've got a problem here and I'm really worried. My boyfriend, who is 16, suddenly started having sudden memory problems. They started back in November or December. He had a "killer" headache in the center of his forehead. It had been lingering all day, then that night we were at my house and he passed out. I went to move his hair from his face and he jolted awake. He had a really confused look on his face. I asked if he was ok and he was like "Where am I?" and "Who are you?". He had no memory of his past, or friends or family or anything. I started talking to him, helping him remember, and when I told him he could play the guitar, he didn't believe me. I handed him my dad's and he just started playing it but he couldn't figure out how he knew the songs. After about three hours, he feel asleep again and woke up and was alright, but didn't remember anything from the last several hours. He remembered falling asleep, then waking up.
This has happened three more times, once near the end of December, once around Jan.9th and tonight. On Jan. 9, it happened during school(around 11am) and lasted until around 7pm. Earlier, he txted me and said that it happened again. Luckily, he's at a friend's house who can explain kind of what's going on. It's killing me that I can't be with him right now, but I'm stuck at home.

When he "changes", he remebers whatever happened from the last times he did it, but can't remember anything from his "normal" life. His personality doesn't really change. He's a curious person by nature. He's a gentleman, and really sweet. None of these things thing. He just....can't remember...

I'm worried that it might be a concussion or something, but I've never heard of anything like this. I didn't think that amnesia would switch back and forth like this. I've done reasearch, but haven't turned up anything quite like this.

Please, someone give me some advice. I'm really worried. I don't know what to do.

Thanks,
~Worried out of her mind