HIV :: Tingling Sensation In My Throat And Acid Refluxes After Sex?

I was in Brazil last month and had sex with 4 prostitutes on May 12,14 and 24.

I used protection all of those time, and after removing, checked for any tears too, and found none, no slippage as well.

1 week after sex, I had this weird tingling sensation in my throat and acid refluxes starting from June 1.

I immediately saw a doctor who said its just an infection and gave me Hexamidine oral spray. Did not make a lot of difference.

I got tested on June 3 (7 days after the last sex encounter and 18 days the first sex encounter).

All that exists in STD, from gonorrhea to HIV 1/2, and used the 4th gen test methods. Everything was negative.

I was not satisfied with my throat condition, so I saw another doctor (General Physician), he noticed white discoloration of my tongue and said it was tonsillitis, and said I was not drinking enough water, which was true at that moment.

I am a 27 yr old man, now I am not sure whether there are tonsil issues at my age. He did another test on June 10, for fungal infection in blood and that too was negative.

As of now that white tongue issue still exists, with little swelling exactly under the ears, no pain, no fever, no flu and no other gland swollen, just dry throat and tongue.

I am not sure whether, this is a cause of worry for me, I did had oral sex, licked the Vagina, but the girls looked clean.

My question is should i be worried about my throat issue, or its just another normal/regular infection, because the timing of the infection seems to be off and I am worried that this might be oral thrush or something like that.

Also I wanted to ask how accurate these results are for STDs between when I had sex (May 24) and got tested (June 3).