Hi JLJ, yes there are many resources. Are you from the USA then? Welcome back!
Can you tell us what kinds of behavior problems you have seen over the past 4 years? How was his early history, development, play with other kids, speech/language development etc.
Is he receiving any special support at school? How is his school work? Kids who have behaviors that interfere with their school life, academically or socially, are eligible for an evaluation for special services. Your school may try to tell you, if he is doing ok academically, that he will not qualify but that is not true, so to start you write a letter asking for a complete evaluation for special needs services including ability, academic, social/emotional, behavioral and motor testing. SEnd this letter certified mail with a return receipt because this starts a mandated time clock. The district only has a certain amount of time to complete the evaluation.
In the mean time, ask your doctor for a referral for a neuropsychological evaluation. Do not ask if they think you need one, just say you want one, you know ther is something wrong and you want to start now getting information. they may suggest going to a psychiatrist or neurologist, and that is great, but you still want the neuropsychologist because the perspective is broader. They can help do a differential diagnosis, if you go to a neuro you may get a neuro focused diagnosis and at the psychiatrist, a mood, behavioral diagnosis.... Not always, because some are really good at looking at the big picture. They may too send you to a developmental pediatrician and that can be very good too. They help figure out diagnosis in children with deveopmental and behavioral issues. The neuropsychologist testing is very comprehensive and will help you make a case for help in school.
Many kids need support to develop skills for dealing with frustration, how to play with peers, how to be organized and to follow directions etc. These are essential school skills and are as important as academics and legally are to be included in assessment and delivery of services.
OK, so now we have a start, but it is overwhelming.... We all know that so I am just giving you a little bit of a start but there will be many that come along. We all come from different backgrounds but we all understand the struggle trying to sort things out so take what feels right for you and the rest, just know it is offered out of care and concern.
You have found a truly supportive group here and we are happy to have you. HUGS, Buddy