I may have lost my voice, please help!?

First of all, you have indeed abused your vocal chords by exceeding your range limits, so please do not do that any more unless you know exactly how to do it safely! In order to broaden your range, please contact a fully trained vocal teacher to show you how to do it without harming your throat. If you try on your own, you will eventually get vocal nodules (and whatnot) and that will jeopardise your voice for good. You should stop singing completely for, say, a week, but if the hoarseness continues, please consult an ear-nose-throat specialist to rule out vocal nodules.