Second day getting over a terrible stomach virus and still feel stomach ache. is it okay to eat now? still feel lightheaded and nauseous

Sure: There are no restrictions on your diet. Just eat whatever you feel comfortable with. You can avoid spicy and acidic foods. Keep hydrated!!

Eat lightly: If still nauseated try some Ginger ale or ginger tea to calm the nausea. Eat or drink small amounts at a time and avoid "heavy" meals. Soups, toast, etc. would be best. If your symptoms continue speak with your physician.