Your blood test
especially PCR test and P24 Antigen test done after 4 weeks after your suspected contact is more valuable and the same are negative repeatedly rules out the possibility of HIV
for you. These two tests are comparative to the other antibody tests have very short window period as shorter as 3 weeks. So there is nothing to worry about HIV.
When your ENT consultant assure you about your throat condition you need not worry further. Anyhow you can go for a culture test from your throat for Gonorrhea
. Chlamydia and nonspecific organisms and if they come negative then you totally ignore your problem.
Get well soon.