My son is diagnosed with ADHD inattentive w/o hyperactivity. We started out working with behavioral therapist at least once a week, but eventually that wasn't enough and we had to try meds. The first stimulant we tried (concerta) worked great, which I understand is a miraculous occurrence, but then 2 years later my son developed tics so we had to stop the meds. Problem is, my son gets incredibly frustrated when he's not medicated and he asked to take meds again this school year. His new doctor prescribed Strattera, which isn't a stimulant and shouldn't trigger his tics, but it's not working. the doctor raised the dosage but we're doubtful that it will work.
I highly recommend behavioral therapy, talk therapy, and medication management by a child psychiatrist. I would also suggest finding a therapist/psychiatrist office that will help you arrange wraparound services. A wraparound social worker may be able to help you get your son an IEP with the school district to help him until you can get the medication situation straightened out.