Try calling insurance. The more you bug them the faster they seem to get things done so you won't bother them anymore.
My diet I guess isn't the worse one out there. I can have 1 serving of oatmeal, 1 small yogurt, I small piece of fruit, 3oz of chicken breast or fish with no sauce or seasoning, and 1 cup of veggies. It is less than 600 calories a day. It isn't so bad in the mornings, but after work I seem to be the hungriest and the small dinner isn't cutting it.
I hope you get your date soon! It does make it real from that point on (so does the pre-op diet)!