I feel your pain!! When Dr. Miranda told me I had to lose 48 pounds before surgery I flipped out!! I mean, if I could lose weight like that, then why would I need Lap-Band, right? Well, I have to say it's not easy, but it is do-able. I am still 39 days out from my surgery, and I have lost 22 of my 48 pounds. I am doing the same diet as you. Find a few flavors of protein powder you like and stock up on lean cuisines. I have learned to love sugar free jello, and when I get super hungry, I eat a salad.
I think pre-op diet is as much about changing the way you look at eating as it is about losing weight and shrinking the liver. Do some soul searching and see if you can find out WHY you eat. And just remember, you can do this!!! It is the first step to your new life. Once you see those pounds start dropping, you will be so pumped to keep going! Good luck and welcome to the family!