I keep getting tonsillitis, despite x 2 penicillin v prescriptions. aos blood tests "upper range of normal" what treatment would help?

Don't overtreat: Penicillin won't prevent future attacks, and is appropriate only if there's good reason to think this is strep throat. Antistreptolysin O titers are useful only if actual rheumatic fever is a consideration; don't over-interpret these or any other labs especially when they're in reference range or you'll go crazy. Ask about tonsillectomy given that there's variable evidence / thought.