I have meltdowns only extremely rarely, maybe once or twice a year, and never in public- I'm so self-conscious. They were mainly caused by frustration- I just couldn't stand not understanding other people.
From what people describe here, I often have a shutdown. A good, full on one will be pretty rare, and will be caused by criticism. Yes, criticism If someone is teasing continuously, I will say 'shut up' constantly, or cover my ears, because unless they shut up soon, I will totally 'fly off the handle'. I will just curl up, cry, or silently torment myself inside. Then I'll lose it, go up to my room and throw a few things, bite things, clench my fists, and rock back and forth. My bed is my absolute haven, and is the only place that can possibly calm me down. No-one knows they even happen, as I as I normally quite good at controlling my shutdowns.
Someone said to me today that I always seemed, miserable, nasty and ready to 'fly off the handle' at any time. But that's because I'm trying hard NOT to lose myself. XD
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Some people are autistic... deal with it!
Self-diagnosed female Aspie (AS- 171/200, NT- 26/200)