Painful tailbone! Advice?

I don't know how, but I woke up one morning with the worst pain in my tailbone. When I wear jeans or walk a certain way it literally feels like I can't breathe because it hurts so bad. When I'm wearing sweatpants it feels slightly better, but even sitting on a cushy couch is painful. The pain started about a month ago and went away for a while, but then started again a few days ago and its really hard to function in school. Any advice on how I can heal it or what type of doctor I should see? Or does anyone know how to diagnose this?