1. Persistent Symptoms: Your symptoms persisting for 15 days suggest the initial treatment may not have fully resolved the issue or another cause might be present.

2. Consult a Healthcare Provider: It's advisable to see a doctor for a thorough evaluation. They may conduct tests and recommend a different treatment plan.

3. Avoid Self-Medicating: Do not start new antibiotics or medications without medical advice to prevent side effects or resistance.

4. Symptom Management: Rest, stay hydrated, and consider over-the-counter remedies like saline nasal sprays or paracetamol, but only as directed.

5. Watch for Warning Signs: Seek immediate medical attention if you experience high fever, severe headache, vision changes, difficulty breathing, or worsening symptoms.

Consulting a healthcare professional will ensure you receive appropriate care and avoid complications.