Sophie didn't eat "right" for a day or two after the spay. And, as the others said, if nothing comes in - nothing goes out. It's a good sign that she's peeing!

Just FYI on the antibiotics:
ORAL penicilins such as Amoxicilin and Clavamox can kill rabbits. They destroy the good "gut stuff" (flora, etc.).

If Thelmer still isn't eating right, you might try giving her a couple tablespoons full of plain yougurt or the pineapple/pina coloda kind. Most bunnies like this as a treat plus it has the same effect as papaya/pineapple tablets.

Baby food is another option to try!