If its not completey come apart, then grab your dremel, and carve a large-ish groove into where it has cracked. Then fill it in with some super strong glue or epoxy. Then filler over the top. It'll be weaker than if it was solid, but it should hold.
Its alot like welding
oh, and beware of the instant-heat to instant cool (the ac)
I'm no expert, but if its anything like metal that could make it break more/shatter.
Either way, your a smart lass, I'm sure you can fix it.
Hows your back doing?
All I can suggest is see someone immediately, if you leave it as long as I left it to go get my back seen to, you'll find out that you've done yourself more damage, maybe even permanent damage.
Of course, we have "free" healthcare, but then again, like someone else said. It doesn't mean its good health care. as soon as he saw me "Nope, your stupid stunts have gone too far and this time its irreversible. Congrats and welcome to a painful life."
Of course, that wasn't the case, after I saw a better doc. So maybe the health care you have to pay for in the US is alot better. *shrugs*