Dude, like, go to a dentist. If you feel helplessly broke, call social services and find out how to get dental care for the helplessly broke. Or suck it up the price and get it taken care of. They may just yank out the tooth (cheapest option), but it should make the suffering stop.

Seriously. Like, make an appointment now. You can't afford to worry about it too much, just do it. Deal with the fallout later, when you can think.