How can i get over depression?

i dont know wut to do. i found out today i was 143 pounds at the height of 5'5 and i knew i was fat but not that much. i want to loose weight and i want to have goodwill power because my plan from now on is to eat ice cubes . i am genuine about this. to me weight is everything, cuz im a dancer, dancing is my life, and if im too big ill be kicked out of the company. ive been so depressed i havent even been able to get out of bed to exercise plus im really sick 2. i went to the doctors today and they weighed me. i have purged after ive eaten in the past but that doesnt help me loose weight so im not doing it again. im so sad and soemtimes i just dont even want to get out of bed. will u please give me some advice......i feel like im wasting my life away