Hi and welcome,
i suspect you are suffering from acute pharyngitis
which is mostly bacterial or sometimes viral infection seen post flu infection.
it is associated with sore throat
, runny nose , fever and cold.
I would suggest you to start with antibiotic Augmentin
375mg twice daily along with analgesics and antihistamine like cetrizine for 3 to 5 days.
mouth gargling with antiseptic mouth wash like chlorhexidine
gives soothing effect to throat.
if symptoms do not subside with this . you got to consult an ENT surgeon for evaluation.
i hope this helps,