Worried for counselling 2mo :/?

I am 5'7" and 18 male and weigh 123lbs, I have lost 6lbs since I last saw my counsellor and really worried because I was told if I lost anymore weight I will be put into an inpatient private clinic to deal with emotional and physical issues that I apparently have! I have starved myself to get to this weight because I was sick of people saying that I was overweight and I was bullied in high school, in December I weighed 160lbs. I was admitted into hospital for dehydration and then again for Chest pains and fainting :/ what should I do?