My meltdowns are caused by either anxiety, irritation or anger.
I call the anxiety meltdowns ''panic attacks'', which are usually caused by snow being forecasted. Snow makes me anxious because I have Social Phobia, one of the symptoms of this being afraid to draw attention to oneself, which I can't avoid when it is icy because I'm more prone to slipping down on ice due to my balance issues, plus I go all stiff because I think everybody's watching me, which makes me slip even more (it's a mind over matter thing). Also I know how immature some people are, the way they have to humiliate a person when they fall, instead of giving them empathy (see? This is one evidence how NTs can lack empathy). But I can't avoid going out because the ice is sometimes prolonged for weeks, and I can't just shut myself away for weeks, especially if I had a local job.
I call the irritation meltdowns ''meltdowns'' because I do actually melt down. When something like the internet cuts off at awkward times and causing a disruption to my task I was trying to do on the internet, I sometimes drop onto the floor and start crying loudly like a 3-year-old, and I yell out loud how much I hate modern technology because it's never as reliable as you think it is, and how they raise the phone bill but make the internet connection unpredictable, and so on.
And I call the anger meltdowns ''outbursts'' or ''nervous breakdowns'', and usually this is triggered off by thinking too deeply why I'm an Aspie and nobody else in the family is, and how they get to live a life with average social skills and I can't, and that I'm not very clever either and so I've just got to live like it. Also I start realising how much I absolutely loathe myself and want to get away from myself but can't, and the way I am and the wrong vibes and body language I always give off, and how I have to avoid social situations because of my social awkwardness, and so on. I know I can't keep wallowing in pain about it, which most of the time I try to forget it and get on with life, but I can't always help dwelling on it from time to time.
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Female