I appreciate everyone giving their perspectives. It's very helpful to be reminded how everyone's situation is unique and to not be overly skewed by my own experience.
Judge, it's funny you mention jurisdiction. I am in Canada. In my last appointment, my counselor discussed how I'd likely be eligible for a disability tax credit. This was the biggest epiphany for me. Not the money part, which could be quite significant. It was the disability part. I'm still having difficulty wrapping my head around that. I have felt like I've been hanging on by a thread for years now. Accepting that I have a disability means accepting that I need support... accepting that I need a break. But I have no support. None. It's the opposite. 50/50 parenting - I need to support my kids. I can't take a break. A tax credit is nice, but not what I need. And like you mentioned, if I google anything about autism support for parents, everything is about the NT-parent ASD-kid dynamic.
You also mentioned another source of stress for me - the "need to know" thing. Given the genetics of it and my suspicions about my daughter, I feel like my ex-wife deserves to know. She did some things during our separation that scared me, and I'm not sure what she's capable of. I don't think she'd use this information against me, but I can't rule it out and that stresses me out to no end. I even asked my psychologist about it and she had said she would need to give up her files to a family court if subpoenaed (for example if she tried to use this to take away shared custody). I want to be completely honest with my psychologist but this makes me hesitant.
Seeing everyone else's responses really makes me realize that I'm in about the worst possible situation to go through this. It's not only that I started from feeling at rock bottom and have no support system. It's understanding that I have a disability, that I have unique needs, that deserve a mental health break, I deserve support, I deserve relief from this horrible constant toxic stress... but I don't have and can't do any of that because I have people that rely on me, no union to protect my job, no family or friends. It's making my anxiety worse, I feel like I'm on the verge of that thread snapping, which is why I'm starting to have regrets about going down this road. I'm sure my perspective would be completely different in a better situation.