I agree @Lighttodark
It's very different from the nervousness or worry you feel before a big work event or driving test. Those things are uncomfortable but you are worrying about practical difficulties and processes.
Anxiety (for me) is more linked to worrying about how you feel, how other people feel - it's much more emotionally linked. It grips you like a vice.
Once I'd laid down, watched some trash tv, drank some water, purposefully relaxed and cleared my mind, it very gradually subsided. It took about 2 hours though. There's no quick fix for that feeling.
If a child or teen experiences it unexpectedly and didn't know what it was it could be very frightening.
My ex once had a panic attack, for the first time age 42, due to some extreme prolongued stress he was under. He genuinely thought he was having a heart attack. He even said 'it can't be a panic attack, I'm not the sort of person that panics'. He wasn't, he was strong as an ox mentally
But a panic attack is a physical response to extreme stress, your heart races uncontrollably, your mouth goes totally dry, you can't take a breath, you literally feel like you are fighting for oxygen. It takes a long time to subside.
Again, the phrase 'panic attack' almost undermines the reality of the extreme physical response that your body goes through. It's very scary, very real.
I feel very compassionate towards people that suffer from this every day. It's absolutely disabling.