Fever with dry cough for 2 days is most likely a viral infection, and taking Paracetamol is appropriate, but it should be taken every 6?8 hours as needed (not just twice daily) within the safe dose. Drink plenty of warm fluids, take rest, do steam inhalation, and avoid cold exposure. Feeling weak and cold can happen with fever, but monitor your temperature regularly. If fever lasts more than 3 days, becomes very high, or you develop breathing difficulty, chest pain, or severe weakness, consult a doctor promptly.