The symptom you are describing is generally associated with acid reflux...not STDs.
Take a look over at the GERD/acid reflux forum, and see if anything you read there is similar to what you are describing.
Ask your doctor to test for acid reflux as well.
Have you seen an ENT Specialist yet?
I have GERD/acid reflux myself and this doesn't sounds like that.
Have you been thoroughly screened for STDs?
I have tested for syphilis & gonorrhea (After 6 week of condom broke) and the results are negative.. Do u have any idea what stds symptom might it be.? No, i just want to confirm that i don't have any stds, then i will see a ent specialist doctor... plz help me... :(
Consult an ENT Specialist and get an assessment and a throat swab/culture done as soon as possible IF not done already. In fact, a regular physician should be able to do the throat swab/culture.