i have yet again failed

so right now i need some help and immediatly. everything in my life is wonderful except for this eating thing. i dont know underlying whats causing me to start this vicious cycle. now except for not eating im binging and purging again. i cant stop. i try but i do it anyway. i do not and i mean do NOT want to do this. i have a great metabolism and dont want to ruin it. ive only been doing it like twice a week for like 2 months now. but i still want to stop. i cant have this control my life any longer. please please please give me some advice on how to get thorugh this. ive beaten it before but this time its harder.