Sorry you are in so much pain. My daughter had the same thing and the doc told her she could try the chloraseptic spray that numbs your throat. Then before we left the office the doc changed her mind and prescribed something called "Magic Mouthwash" (Yes it is actually called that!) The mouthwash had benadryl, maalox (to coat the throat) and lidocain in it. They mix it at the pharmacy. My daughter said it didnt taste the best but then nothing did to her at that point, but it sure helped with the pain.
You might want to try the chloraseptic spray and if that doesnt work, ask your doctor if there is something you can use for the pain.
Hope you are feeling better soon!
~Breny