iPhone won't stop rebooting?

I tried to update my iPhone today and like pretty much everyone else, I had a lot of trouble. Something happened during the update, though, and now my iPhone won't stop rebooting. I can turn it off if I hold down the home and on/off buttons, but when I turn it back on, it starts rebooting/turning off again. It won't show up on iTunes or on my Mac so I can't even try to restore it... I'm pretty far from the closest Apple Store and don't know what to do. Any suggestions? Is anyone else having this problem?