Can anyone help? A couple of days ago I got diagnosed with tonsilitis and have antibiotics from doctor. I am also in a lot of pain in the mouth area, especially on one side. On examination I have white spots on my upper gums, on the roof of my mouth, at the back inside of my mouth (there's one large painful one here) and I can hardly sleep because of the pain. Is this an offshoot of tonsilitis or something else?