"I'm supposed to eat 2150 cal with no exercise and I just eat less than 1000 cal"
go see a nutritionist.
you're doing this as a life change - not a fad diet
i've tried this before and it doesn't work - well at least for me.
eat several small meals a day to get your motabilism moving.
imo, removing 1150 calories from your normal intake is not good.