Help:how to lose 10 pounds PER month?

im 30 pounds over weight and my doctor says i need to lose it so i dont get type 2 diabetes. are there any ways u no how to lose 10 pounds per month?? i have a treadmill(which i hate to use) and a exercise bike that hurts my :) i only eat 3 meals a day for my nutritionist. p.s. i have astma! so any options or ideas help!! i need to lose it by may!!