Hello and welcome to health care magic. Thanks for your query
As per your description it seems like you are having upper respiratory tract
infection. Could be tonsillitis
It could be due to viral infection , which will subside by just supportive measures like proper hydration, with plenty of oral fluids, bed rest
tablet for fever.
As you are already doing salt water gargling, that will help to reduce the inflammation and congestion of your throat so you continue to do it.
Sometimes secondary bacterial infection may worsen the symptoms even after above mentioned supportive measure in such cases its recommended to consult physician to start of With appropriate antibiotics.
As you are already taking painkiller the inflammation will come down with some pain relief
I would suggest you to consult a physician to look into your throat , and to start of with appropriate antibiotics.
Sometimes conditions like peritonsillar abcess ( quinsy), which is infection of floor of tonsils which may need surgical drainage
. So consult a doctor to make a proper diagnosis and treat.