Hello dear I understand your concern Food poisoning produce diarrhea and vomiting that lead to dehydration. And because of dehydration it also cause headache and dizziness like symptoms. Better management should be done by consulting the MD physician after proper evaluation of the dehydration signs and symptoms. As a treating physician, I will give following advises. Finish the metronidazole. Tablet vabact-ds. Stay calm and ORS solution to maintain the hydration. Take boiled rice with added salt and lemon Tablet pantoprazole plus domperidone on empty stomach Taken more chicken breast soups, yogurt,curd rice, banana, applesauce and toast (BRAT diet). Hope this may help you Contact HCM for further health query Best regards Dr. Sagar