Good for you! You are on the right track! group sports, I say fergitaboutit! lol Not going to happen! lol Push, and push! Is there anywhere else yo ucan go for OT eval? In the meantime treat him as though it is SPD, start the sensory diet, look that up and gear yourself towards that. Pediatricians do not know much, believe me! that is not their thing. If you are worried about fine motor, start with tings like picking up toys with large tweezers, playdough, wringing out dishrags, tearing paper, cutting, things to build up the hand muscles. These are things you can incorporate at home. It will also be a mindless activity that will help to calm him.
My son has banged his head on things a few times and that was just when he was SO frustrated he could not take it anymore. I have gotten that to stop by getting him on a sensory diet. My son used to line up his cars over and over again because they were never perfect to him. The OT made me stop him from doing that immediately! Not by taking them away but showing him how to "play" with them. You will find that each year going into a different classroom there will be challenges. They like structure and things to be the same, well now here we are in a new room, new kids, and a new routine. What I do every year is take my son to school before school starts. We meet the teacher, he sees the room, he gets to pick his desk ( which is usually by the door so he is not stuck in the middle of the mix of stimulation) . Routine is so very important to their exsistance, I have to discuss everything that will happen before it does, I have to give a 5 minute warning before something will end because he CANNOT transition very well. The teacher does it too. I do let him know that sometimes things happen when we don't want them to that is life. Things cannot always be planned out. SPD is not I the DSM-IV , but if you have speech therapy it can be placed under that "umbrella" that is what they did for my son. Never stop being an advocate for your child. If you can volunteer at school and get known, the principal at my son's school has done more for him then the Special Ed department. NEVER allow them to say he is a behavorial problem, he has a problem that causes his behaviors. They can make accomidations for him. Start working on tings that you see, look them up, find out what is setting him off to hit his head or throw stuff and teach a coping skill. You can do this. Then when you get him evaluated you will have a better idea as to what to do and what resources to look into. In the meantime treat it as though it is SPD, is what I say, what will it hurt?