Thanks for writing your query.
You should have the following tests done:-
1. Throat swab culture
2. Complete Blood Count
You should get yourself examined by an ENT specialist
and take, under medical supervision, antihistaminic like Fenofexadine
along with decongestants like Phenylepherine or Pseudoephedrine
along with some anti-inflammatory medicines. Antibiotic can be started as per the throat swab culture report.
Also do warm saline gargles.
I hope this is helpful to you.