Since your current medication isn't working, please do not self-prescribe new antibiotics or strong anti-diarrheal drugs. Your immediate priority is hydration; drink Oral Rehydration Salts (ORS) or plenty of fluids to replace lost electrolytes. You can take a probiotic to help restore healthy gut bacteria. However, because your symptoms have persisted for two days despite treatment, you should consult a healthcare professional for a proper diagnosis and targeted prescription. Seek immediate medical attention if you develop red flag symptoms like a high fever, severe abdominal pain, bloody stools, or signs of severe dehydration.