How to stop purging !!!!?

i dont know what i am anymore.. :/ i have been diagnosed as anorexic.. but my treatment doesnt start until tomorrow. i was diagnosed about 2 months back. then i was clearly anorexic, but not i seem to binge and purge about 2-3 times a day! its not a massive binge.. usually about 200-300 calories but i still do it again and again even though i always say 'this is the last time ill do this!' how can i break the cycle!? i have already taken ALL food out of my bedroom, but i seem to do it automatically when my parents both go out. i cant tell them i do it - it would killll them. but i will tell my therapist tomorrow if i build up the courage. i have such shame of it cause i think of all the starving kids in africa and here i am being so selfish :( this needs to stop. NOW. but how?!