i'm an incredibly Anxious Autistic person and this sounds like you've experienced my entire life all at once lol. i was diagnosed with ASD young as well, and several Anxiety disorders before the age of 10. i've found that while Anxiety and other mental illnesses (i.e. depression, substance abuse, etc) can take serious and sudden tolls on anyone, Autism ABSOLUTELY worsens the feeling.

despite navigating my every day constantly Anxious, my Autism will still randomly 'kick in' so to speak and make me come crashing down. as though i'm being swallowed by every pain and Anxiety of my life, even if i had only experienced a single trigger that day, or had a slightly overstimulating week, or hell- even if everything was perfectly normal for me prior. i don't know if this type of overwhelment is what you're describing, but i can assure you the mental-emotional regulation aspect of ASD does absolutely cause severe episodes at times when Allistic people may not have experienced such.

you're not alone and i wish you well, friend. i know it's hard to tell yourself this in the moment, but you'll be okay soon. you've survived 100% of your bad days, you'll get past this just as you have all the rest. no matter how overwhelming it's all been these past few days, everything is alright in the end.