I just had my tonsils out, but I never had tonsillitis as painful as you've described. I would go to the doctor and describe how bad it is, and they will prescribe you some proper painkillers. In the meantime when I had tonsillitis I was advised to crush aspirin, dissolve it into water and gargle. Also get the max strength Strepsils that have some mild anaesthetic.
But go to the GP, there is no point suffering when you don't have to.