DS 9 has mild ASD (newly diagnosed and mainly affecting processing speed) and is becoming increasingly anxious. He's started receiving additional wellbeing sessions at school and he's recently told the teacher that I make his life hell and have 'erased his mental health'. We're in a situation where every time I ask him to do something (e.g. 'It's time to brush your teeth now please') he refuses to do the thing and then says that I'm screaming at him (which I'm not) and I'm 'damaging his mental health'. When we talk about this once he's calmed down (which we always do) he seems to genuinely believe that having me as a parent is damaging him in some way and that I am his enemy.
I think he almost certainly has PDA to a degree and I've tried all of the strategies I can find to try and get home to do things without him feeling I am making demands of him, but the reality is that in the mornings, for example, there's only so long I can spend making non-demanding comments (such as 'Do you think it might be time to get dressed now?') before we're both late and then it's a huge stress to get out of the door in time. Reward charts etc. don't work as he can't equate action with reward.
He's what you might call academically gifted (142 in recent CAT4 tests, reading age of 15, the educational psychologist who assessed him for autism suggested he should be put up at least 2 school years), but his emotional intelligence is probably a few years behind his actual age.
I'm really at a loss as to how to handle this and need some practical advice on how to improve our relationship and ensure he doesn't spiral further. I'm not looking for criticism here – I'm really trying my absolute best and am having therapy to try and work through my own issues to ensure I'm being the best parent I can be – but I would like some resources (books, podcasts etc.) that might be able to give advice, or to hear from people who may have been in similar situations.
I try to do fun things with DS as much as possible (things he has chosen, e.g. cinema, bike rides, play dates etc.) but they pretty much always decent into DS shouting at me and storming off because I've done or said something he deems to have damaged his mental health (which could be pretty much anything from asking him to turn the radio down when I'm driving to suggesting we do an activity).
For background DH works away so I am the main carer, and DS is an only child.