Excess stomach acid severely irritates your stomach lining, triggering your brain's vomiting reflex. If this acid irritation or an underlying gut infection spreads to your intestines, it disrupts water absorption and speeds up bowel movements, causing diarrhoea. To treat this, an acid reducer, such as Omeprazole or Pantoprazole, helps lower acidity, while an antiemetic, like Ondansetron, can stop vomiting. For diarrhoea, prioritise hydration using Oral Rehydration Salts (ORS) and take probiotics to restore gut balance. Because combined vomiting and diarrhea can quickly cause severe dehydration, please consult a doctor for a proper diagnosis and prescription before starting these medications.