Could I possibly have a torn meniscus/ ligament damage in my knee? Need answer ASAP please?

I fell at drama practice last wes. when i was dancing. i don't really remember what happened but i know i heard a pop. went to the emergency room and the dr. there said i either ripped a filament or tore my meniscus. Its been four days since then and my knee is still swelling, i can't put any weight on it unless its wrapped in an ace bandage and even then its only a little, i can walk on it if i turn it sideways but that's about all...i can't bend it all the way back or hold it all the way straight either...and when i prop it up it has to be below waist level or it hurts too much...could this possibly mean i've torn something in my knee?