I need major help with anorexia?

i have been suffering with anorexia and bulemia for ages. i have body dismorphic disorder when i look in the mirror i freak out. i am soo fat i think. i am 13 weigh 120 pounds ( 54 kgs) and i am 5'7. i will not eat for about 2 weex then canmt take it anymore but then i start eating again and feel really guilty so i start vommitting on purpose. i have vitamen deffiecency anemia and hair loss. i am so moody and tired and often fall over. i have next to no energy at schoo, and my grades are horrible but im to scared of gaining weight and when i do i spend ages crying my parents have no clue and i cant tell them cuase the will freak out i dont really have friends anymore becuase i have been so hroribe an di cant get professional help i just cant. plz any suggestions on what i can do my bpdy cant take it anymore and i would be happy to become really sick now i have just had enough