hello and welcome,
After reading your symptoms i can say your are suffering from Acute Tonsillitis
which is a bacterial infection or sometimes viral infection seen post flu .
It often shows symptoms of fever
, pain and discomfort in throat , white patches on the peritonsillar crypts ,mucus from nose.
i would suggest you to start with Augmentin
625mg along with analgesics with paracetamol
twice daily for 3 to 5 days till the symptoms subside .
use lukewarm saline water or antiseptic mouthwash for mouth gargling which will give soothing effect.
drink lot of water and keep yourself hydrated.
NASAL polyp needs clinical examination , if the symptoms do not resolve with antibiotics you need to consult an ENT surgeon ad get it surgically removed.
i hope this helps,