Eating disorders genetic? types of bulimia?

Im 19 years old and I have a 16 year old sister. we have the same personality/sense of humor/interests/and thoughts. we've always been pretty close. My sister has been suffering severe bulimia for 3 years now, she finally started treatment a couple months ago and is starting to recover. she recently pointed out that i have a form of a bulimia too. i thought she was crazy because ive always been an emetophobe (intense fear of vomiting/seeing vomit). but I do have a strange relationship with food and my eating patterns are consistent and unhealthy. I take adderall and have become dependant on it. I eat the same thing for breakfast every damn day of my life and im very OCD/paranoid about food and food content. I have a yogurt/granola parfait and a large coffee first thing in the morning. then i take my adderall and i dont eat for the rest of the day. so basically i get 250 calories every morning and run around on speed all day and it has caused noticeable weight loss. after two or three weeks of this (normally on a sunday) I reach a breaking point and i WANT food. so i dont take my adderall that one day and I eat EVERYTHING that I had missed out on the past couple of weeeks. I stuff myself until I feel sick and its almost as bad as my sisters binges when she was bulimic. i used to feel guilty that i was triggering her bulimia whenever i had binge and she was around. The difference with my 'eatting pattern/disorder' is that i dont throw up after. I just get depressed and guilty and begin the starving process again. Ive been doing it for about a little over a year now and its starting to get to me. Is there a name for this condition?