What is wrong with me?

Had Leukemia 6 year ago. I currently have similar symptoms i had when i was diagnosed. Fever, sore throat, body ache, dizziness, headache. Im 16 year old male. I am scared because the docs said since its been 6 years it wont come again. what else do i have then?. And i currently had spacers but into my teeth which hurt a lot!