
Theoretically most of these can overlap with ADHD, but I think a shutdown could be indicative of autism. If you are having trouble with those symptoms then I would absolutely suggest looking into resources intended for autistic people to help deal with that. If you were not diagnosed with ADHD and you expressed that you had these symptoms, I would assume you are autistic. fwiw I am professionally diagnosed autistic and have been diagnosed for most of my life (since 17mo).
I want to push back on this slightly. Not to totally reverse what you’re saying, but a nudge. Only you have access to your internal experience, which is where these overlapping conditions manifest. Self assessment is in the toolkit for autism, and it needs to be. How you describe your experience is going to dramatically change the resulting perception and diagnosis. For me, the specific phrasing of a question drastically changes the answer I give in a way allistics do not “grok.”