Please stop taking Megamentin and Azithromycin immediately unless specifically prescribed together by a doctor. These are strong antibiotics that fight bacterial infections; they are completely ineffective against viruses. Taking both concurrently without a confirmed bacterial infection is unnecessary and can cause severe gut issues. For immediate relief, take Paracetamol to manage the fever and body aches, stay highly hydrated, and do warm salt-water gargles for your throat. Since your fever keeps returning, you must consult a doctor. You may have a specific viral illness (like influenza) or a bacterial throat infection that requires a targeted, professional treatment plan rather than self-medication.