Hello Momaroo: Well... as you probably realize, we here on PC cannot diagnose your son.

Our purpose here is to provide one another with support & to share experiences & information. And since I'm not a parent, I'm afraid there's little I would be able to offer other than to say that, under the circumstances, perhaps a change of psychiatrist is in order? From what you wrote, it doesn't sound as though the one you're seeing is taking much of an interest.
As an adult, I expect the psychiatrist I see to handle my appointments the way your son's is being handled. But, at least personally, I'd be concerned given the way this psychiatrist is handling you son's case.

I do think it will be important for you to find your son a new therapist, or perhaps a child psychologist, as soon as possible. Here's a link to a listing of parent's & children's resources from PsychCentral's archives. Perhaps there will be some helpful information there. (Note the "Find a Therapist" box a little ways down the page to the right of the screen.):
https://psychcentral.com/resources/P..._and_Children/
Also, here's a link to an article, also from PsychCentral's archive, on the subject of aggressive children:
https://psychcentral.com/lib/aggressive-children/
And lastly, here's a link to a PC article on the subject of Oppositional Defiant Disorder. Of course, I don't know if this is relevant to your child. But, in reading it, it sounded as though there might be some similarities:
https://psychcentral.com/blog/archiv...r-in-children/
I see this is your first post here on PC. So... welcome to PsychCentral!

I hope you find the time you spend here to be of benefit.

I don't know if you're here just to try to gain some insight with regard to your son's current situation; or if you plan to continue on with us.

However if you plan to continue on, may I suggest you introduce yourself over on PC's New Member Introductions forum? Here's a link:
https://forums.psychcentral.com/new-...introductions/
There's a lot of support that can be available here on PC. The more you post, & reply to other members' posts, the more a part of the community you will become.

Plus there are the chat rooms where you'll be able to interact with other PC members in real time (once your first 5 posts have been reviewed & approved.) My best wishes to you...