How can i stop bulimia?

Today I binged on chips and the chip got stuck in my throat whilst purging. i almost blacked out. I need to stop. I know that i won't purge if I don't binge. Any ways to reduce cravings so they don't lead full out bingeing. I need to lose weight still and want to do it in a healthy way. My goal is to lose 30 lbs. I weigh 200 and i'm 6 ft. I'm a serious basketball player, I lift weights and do weight training every other day. I am a 13 year old girl, which is even scarier. I don't want to lose my life to this soul sucking disease. I just want to lose my tummy fat. Any help is welcome.