Hmm.. thanks a lot for the replies, guys.
I don't have Angina, but thanks for that link.
It is only the back of my front teeth on the top row that hurt. I know I don't have cavities in them, (or at least, that's what the dentist says haha) so that can't be it.
I'd like to lean toward the blood returning to the teeth post that Mastodon left. It seems to make sense. I asked our EMT-Paramedic (I'm just an EMT-B) and she had no clue what it could be, either. I'll ask a doctor or something next time I find myself in the ER.
Thanks a lot, guys. I'll let you know if it's anything interesting