Tonsils are HUGE and completely white!! Help!?

About 3 days ago I noticed my tonsils were sore and I didn't really pay any attention to it until the next morning when I saw that I had white spots on my tonsils. I went to the doctor and they tested me for strep and it came back negative but they gave me amoxicillin to take for ten days, three times a day. My tonsils have continued to swell and they are now completely white. I am not fatigued, nauseous, or vomiting, and I do not have a fever or any body aches! My doctor said she does not believe it is mono so I have no clue what it is! Any help would be appreciated bc my tonsils hurt and its hard to swallow which makes it difficult to eat and drink!!