My eye shrunk...please help I think something may be wrong with my eye?

okay so i have REALLY big pretty eyes, but sunday night when i went to sleep my eyes were twitching a lot, and when i woke up my right eye was WAY smaller than the left eye. my lower eyelid was like really high and my upper eyelid was down a little lower and my eye looked SO messed up when i woke up! my mom said it was cause i slept on the side where that eye is all night and i put pressure on it and that it would go back to it's regular size. but it didn't. and when i went to sleep monday night, i woke up today and the same thing happened. my eye looked so retarded. and i started crying because i don't want this to be a permanent thing...my left eye is really big and than my right eye is smaller than my left. i can barely make my right eye wide. like when you kinda like make them bulge...hahahaha. anyways, i'm really scared something might be wrong with my eye and that this will be a permanent change..what do you think might be wrong? i'm desperate for help. i'm only 13.