Ouch! Why are those four molars at the very back of your mouth hurting you? Well, those molars (another word for your bigger back teeth) are actually called "wisdom teeth" - and they can be painful when they're growing in. Back to Article
There's no need to be scared of being home alone. Just lock the doors, and raid the fridge for food or something.
If it really worries you that much, you should make him listen to you. If he really wants to spend that much time with his girlfriend then they should both babysit you.