These symptoms are commonly caused by gastroenteritis (stomach flu) or food poisoning. The most crucial step is to prevent dehydration. Start sipping Oral Rehydration Salts (ORS) slowly, as gulping liquids can trigger vomiting. Avoid solid foods for a few hours until your stomach settles. Do not take anti-diarrheal medicines like loperamide without consulting a doctor, especially if you have a fever. If you cannot keep any fluids down, notice blood in your stool, or if symptoms last more than 24 hours, please visit a doctor. They may prescribe anti-vomiting medication like ondansetron to help you recover safely.