After you have surgery, you won't have the same starving feelings and it'll be so much easier to watch what you put in you mouth! Hang in there!!!!!
I was on a stringent pre-op diet for two weeks and I cheated (4 times). I was very ashamed of myself because I knew I had done a disservice to my surgeon by making his job harder. In the end, my surgery went fine.
Forgive yourself about the Cookies and strive to do better in the future. Don't forget they need to shrink your liver so they have room in to work with your tummy. DO THE BEST YOU CAN! In my humble opinion, pre-op dieting this is the hardest part.