It is common for fever to fluctuate as your body fights a viral infection. Paracetamol (the active ingredient in what you took) temporarily reduces fever but doesn't instantly cure the illness. You can continue taking paracetamol every 4 to 6 hours (maximum 4g daily) to manage fever and chills. For cold symptoms, an over-the-counter antihistamine like cetirizine can help, while a cough syrup containing dextromethorphan (for dry cough) or guaifenesin (for wet cough) can ease your cough. Rest, stay well-hydrated with warm fluids, and do steam inhalations. If your fever persists beyond three days or you develop breathing difficulties, please consult a doctor.