When mine gets really bad, it’ll feel like a slow buildup of tension that is quickly released without my control. Almost like an attack. In the past, it’s actually felt like a shock as well.
But it sounds like NT people I’ve talked with don’t see it like that 🤔 and frankly neither does the internet at large 🥴
Like you say its a build up of tension that gets stronger and stronger as I get more agitated then it hits a point and explodes into pure fear and complete paralysis at the top end. And I will experience this for something as stupid as calling someone