Fever with vomiting and stomach pain is often due to a stomach infection or food-related illness affecting the digestive system. Rest well, drink plenty of fluids like water or oral rehydration solutions, eat light food, and avoid oily or heavy meals to help with recovery. Keep yourself hydrated and watch for signs like continuous vomiting or weakness. If symptoms are severe, not improving, or you cannot keep fluids down, consult a doctor for proper care.