Your throat infection likely recurred because the previous three-day antibiotic course (cefaclor) was too short to fully eliminate the bacteria, allowing them to multiply again. Your current treatment of amoxicillin-clavulanate (a highly effective antibiotic) combined with paracetamol (for fever and pain relief) is very appropriate for this condition. To prevent another recurrence and avoid antibiotic resistance, it is crucial that you complete the entire course of the antibiotic exactly as prescribed by your doctor, even if you start feeling better after a few days. Rest well, stay hydrated, and consult your doctor if symptoms persist.