Anorexia and her ion treatment please help?

I'm 17 when I was 15 a bf got me into drugs and drinking I only did it once or twice then he broke up with me And I started doing it again I stupid again and then I drooped anorexia and started snorting cokento control appetite I also took anything diet repeated now I do that and i shoot her ion I wantno stop but how I can I get help I live in a upper middle class family and I'd be a disgrace Im 5'10" and 76 lbs Im scared I'm gonna die