Yes!! Allie Brosh is great, and that comic is a really good descriptor of the lead up to lots of my meltdowns.
I actually thought about her lately and wondered if she might be a fellow ND, having read back some of her comics.
Meltdowns present in different ways for me OP. No one would ever have pegged me as having "an autistic meltdown" I don't think. Growing up, I never hit myself or totally lost control. But, I kind of actually do now. Maybe it feels like the genie is out the bottle now I actually know I'm autistic.
Looking back I've realised that, in my teens especially, in order to avoid that kind of public, humiliating, overt response to what I was feeling, I'd dissociate instead. This is apparently quite a common way meltdowns can come out (or, not come out), as a way to detach yourself from the strength of what you're feeling. So, for me it felt more like a panic attack, with accompanying derealisation. I used to excuse myself from lessons at school to "go and get a tissue" because I was starting to feel panicky being where I was, in a room surrounded by people, subject to whatever sensory aggravations were going on, maybe about to be called on to answer a question. Nobody would ever have noticed what was going on with me because I was so good at keeping a lid on it, but I needed to step away and be on my own in the quiet for a few minutes in order to regulate again. And, that kind of detachment from my own emotional state meant that my anxiety and overwhelm regularly came out as horrible stomach and chest pains, migraines and other things.
Another way it started coming out later on was something more like an anxiety attack rather than a panic attack - I didn't have the physical symptoms of a panic attack, but just a rising "oh my god I'm trapped and I can't cope" that quietly built right up to a point of just utter, uncontrollable sobbing and hyperventilation. It also stems from overwhelm, and is also accompanied by this rush of panicked energy that has nowhere to go, but instead of shouting or breaking things or hitting myself, I'll have contained it enough that it just comes out as that messy sobbing instead.
The attempts to suppress it (always unconscious) stemmed from horrible shame, and not wanting to appear out of control around anybody else (or even honestly to myself, alone in private). But it's not good for me. If I let go and just run with the overwhelm and rage and let myself shout and slap myself it clears out the energy so much better, and I suspect would help reduce the physical anxiety symptoms I get otherwise.