What Causes Persistent Sore Throat?

Doctor! I need help.

I have had a sore throat for six months and I have even had an "Endoscopy" and have been to several doctors...all have no idea what is wrong. No virus was detected in some tests that i did and it certainly isn't the flu. All the doctors have given me medications/ antibiotics for inflammation or throat infections, but after using them...there is still no result. Note that my stomach was also checked for an "acid reflux"...this was also negative.



Do you have any ideas on what could be wrong, or what i could do? Thanks