Covid 19 with granular pharyngitis.

I am having mild sore throat for last one month with feverish feeling.It all started one day when i was having dinner i felt like something stuck in my throat. I was having so much anxiety.However that stuck feeling went away. But next day onwards I started feeling mild throat pain, at the same time I started feeling little bit feverish. I immediately did RAT and RTPCR for covid 19 it came negative.After 2/3 days as the throat pain was persistent I took antibiotic thinking it might be bacterial, but it didn't work and I changed the antibiotic after consultation with a ENT specialist. Stil persistently throat pain was there.Then I visited one ENT specialist he diagnosed it to be a granular pharyngitis with cobblestone throat. I started gurgling with betadin, salt water.I felt little bit relieved, but again after sometime pain comes.Again I did RAT, this time it came positive. Now its 3 days I am COvid negative but stil having that sore that and granular pharyngitis..kindly suggest....