I Have Had A Sore Throat Since January. I Have

I have had a sore throat since January. I have hypothyroidism and take synthroid. I have Barrett's esophyogus and take prilosec. I have been to 3 Dr's including an ear, nose and throat specialist. None of them saw anything,2 of them gave antibiotics. I am in pain everyday. Sometimes the pain is swallowing and I can feel something move when I swallow which hurts. It feels swollen. No temp. Dr.wants to do a biopsy of my throat. What are your thoughts?