Harlequingirl

Approximately two weeks ago, I got tonsillitis. It was quite severe..
I went to the doctors and she percribed me antibiotics for about a week.
I got over the Tonsillitis within about a day and a half.
I continued to take the course of antibiotics as stated but now after about four or five days of being off of them, my tonsills are swelling up again and irritating my throat. Why has is come back so quickly, and what do I do now?!