How do I lose 60 lbs super fast?

I'm 16, 5'4, and 173 lbs. I need to lose 60 lbs and I want to do it super quick. I eat very little so cutting down my meal would not be an option since my doctor said Im already completely malnourished. I have problems with exercise. I will walk, or go on a bike, or gym exercise equipment and it wont take me very long at all before Im gasping for air. I've had this problem since I was about 4 or something, and back then I was ultra thin and ran everyday until it started. I dont care how extreme it is but I dont have much money. I just need to lose the weight.