I have a lot of questions. Is he on meds? Does he have a psychiatrist? What does the psychiatrist recommend for his schooling? Are you satisfied with his current sources of care? Are you comfortable that ADHD is really his diagnosis, or the full extent of it? Since you mentioned “infections,” have you ruled out PANDAS? If you have ruled it out, what are you saying is the connection between his “infections” and his behavior? What type of infections?
What you are describing sounds like something different from ADHD.