I am having sore throat pain similar to when I had mono in my 20s...i am 41 now. At random times for the last year or so, I will develop like a burning in roof of my mouth...almost like an acid burn, especially from tomato products, but it will last several days and even produces tongue and mouth dryness. Does this sound like thrush, an allergy, tonsillitis or possible secondary bout of mono? Thoughts?