Not eating anything actually can slow down your progress. I would also find a way to get in water, broth, sugar free jello, crystal lite, the cirkul bottle, there are so many options out there, if you are not getting in the water or your protein you are not helping your body lose the weight.
Can you sit down with your dietitian and go over some other diet options? I am sure its extremely frustrating and painful but maybe they can help you come up with some options for you that sound appealing ???