Hi I'm 17 Years Of Age And I Had Swollen

Hi i'm 17 years of age and I had swollen tonsils for about a year and after many tests with no answers and many medications failing, doctors resorted to a tonsillectomy. However, almost a year after my operation, my throat is still swollen and I have the same symptoms of tiredness, catching a lot of infections and I just want to get to the bottom of it because i'm tired of feeling ill and drained. I hope someone can help me! Thanks