Hunger Pains

I'm fucking hungry as hell right now.  At noon I had a Slim Fast with some flax meal and Benefiber mixed in.  Then I had a Naked Green Machine.  I'm drinking a cherry coke zero right now, and had a single serving of peanut butter m&m's as a snack.  Calories add up really fucking fast.  I feel like I should only have like, 500-900 calories, but 2000 is recommended.  I saw this show about a woman that had weight issues similar to mine and had gastric bypass.  After the surgery she was only eating about 600 calories a day.  According to my rough calculations, I've had about 800 so far today.  I get way too hungry to live on that few.  Right now I feel like I'm about to puke I'm so hungry.  I don't want to have a big surgery again.  It's so expensive, but trying to do that extreme of a cut back without some kind of stomach alteration is rough.