A 22-year-old university student presents with a 2-day history of fever, severe sore throat, headache, and malaise. On examination, his temperature is 38.8°C, pharynx is erythematous with tonsillar exudates, and he has tender cervical lymphadenopathy. A rapid antigen detection test (Strep A test) is positive. According to FeverPAIN score criteria and NICE guidelines, what is the most appropriate management?