Anorexia, bulimia...sumthing, i need help?

this is a lil llong....:( 14, 5ft 1.5 and 116 pounds i want to be 100 im moving soon and it sucks. ive been having probles sticking to a 1200 diet but im not running xc anymore which is why i gained weight. i feel gross half my 0's dont even fit anymore! and im talking macy's 0's meaning like a 2ish in normals or 4. ive been puking like 1 a week cuz i eat too much and i cant stick to diets i do try and keep but my metabolism is sooo slow and i really want to be in a bikini by summer. help? dont yell at me tho, ive reasearched, i wont puke again or eat 200 cals or anything. but i do want to know how i can lose this all and what to do? thank you for your help :)