Ahh dam man that really suchs, have you reported it to the police yet? if you havnt you really should. I know you must be feeling traumatized so just try and concentrate you should probably try to calm your mum down too, she must really be upset and scared right now try and comfort her.
Also if you live in a bad nieghburhood you should get your parents to think about investing in some decent security like metal window bars and a front door gate, its what I have installed infront of my door its like one of those prison ones and its really tough :)
I hope that bastard gets caught btw