C section tomorrow and feeling nauseous with diarrhea

Hi guys I have my c section tomorrow at 11:30. They want me there by 9:30. For the last 2 hours I have been feeling nauseous and have had diarrhea. I know I can’t eat anything after midnight tonight but I am afraid to eat. What should I do? I feel so sick to my stomach what can I do to hold me off until tomorrow?