Throat and mouth issues since 2+ months.

Hi, I am suffering from Scratchy itchy soft palate and Scratchy itchy dry throat since 2 months now. I also have some pinpoint bumps on roof of mouth as well as in the mouth behind the molars. Also yellowish white granules on the wall of throat. Have taken 4 courses of different antibiotics : Cefpodoxime proxetil, Azithromycin, Levofloxacin, Ciprofloxacin, anti allergic: Delcon, Allegra, Bilargic and PPI medicines : Pan dsr and Anti histamine syrups after consultation with ENT doctors but none of these provided any significant relief. Recently I have noticed the skin is also whitish/pale behind the teeth on both sides inside the cheek/mouth. What could be the reason ? Please advise I am very concerned as it could be some serious disease which is being misdiagnosed. Also could it be possible that my throat and mouth problems are related . Please advice as what could it be and what would be the line of treatment .