Welcome in H.C.M.
After considering the sequences of development of your symptoms it appears that you are having acute pharyngitis
which is most of the times is viral but one should consider for other infective organisms as well.
For confirmation of disease and treatment plan you should do-
1- Culture and sensitivity of throat swab.
2- X-Ray paranasal sinuses
3- Blood- CBC, ESR
, blood sugar- (F & PP).
Till the results of investigations are awaited you may take-
a- Tab Paracetamol
b- Warm saline gargling.
I hope your query is being answered.