For a suspected stomach infection with loose motions and ache, staying hydrated is the most crucial step. Drink plenty of Oral Rehydration Solution (ORS) or coconut water to prevent dehydration. You can take a probiotic to restore gut health and Paracetamol for the pain (avoid ibuprofen as it can irritate your stomach). Do not take antibiotics or anti-diarrheal medications without a doctor's prescription, especially if you have a fever or blood in your stool. Stick to a bland diet like bananas, rice, and toast. If symptoms persist beyond 48 hours or worsen, please consult a doctor immediately.