Throat irritation without cough or cold.

I have been suffering from sore throat like burning sensation in throat for last for months and have seem 3-4 doctors for cure. I have take anti GRED ,anti allergic,anti infammatory ,corticosteroids spray(duonase) medicine to treat but it's not gone.It was gone for sometime during medication but now came back.I need advice from best of the ENT docs across the country,have you even see such cases? I dont have any cough or cold or breathing difficulties. Appreciate you valuable advice on this. I did endoscopy of throat in April this year and doc told me inside throat is showing red and that it was allergy.But I never had allergy and not sure what it is. Irritation is in throat area but not in a specific spot. I dont drink or smoke . Tarun