I've experienced regression before. Sometimes it's for a few hours or days, sometimes a few weeks. Every so often, I get a random and inexplicable drop in my coping abilities that returns to normal shortly thereafter. For instance, the other day I was sitting at home by myself not doing anything, when I started feeling tight and wound up, like I do right before a meltdown. I managed to avoid hurting myself, but there was a lot of screaming and pounding the floor with my fists. Afterwards, I spent a while just lying on my bedroom floor because the idea of speaking or moving was too physically overwhelming to think about. It had no obvious trigger and seemed completely random, and a few hours later I was fine, and it was like it never happened. Very strange.
I've read a few of Musing's articles as well, and I like her writing style. She has an in-depth series of articles about her experiences with self-diagnosis and the diagnostic process, which would be worthwhile material for anyone considering the pros and cons of being diagnosed.
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"Survival is insufficient" - Seven of Nine
Diagnosed with ASD level 1 on the 10th of April, 2014
Rediagnosed with ASD level 2 on the 4th of May, 2019
Thanks to Olympiadis for my fantastic avatar!