This is totally off track.
He has never suffered from panic attacks or ADHD
He is a very normal well balanced child.
These experiences have sometimes occurred when he has been unwell.
But just as often have been when he has been going to sleep.
Probably worth adding that except for these occasions he never has any trouble going to sleep - usually out like a light in minutes.
This is what I found when i googled 'fast feeling' it matches his description very well.
"Iv posted this under mental conditions but am clueless to what may be causing this.
I am 20 years old and for at least the last ten years I have been getting what I used to call as a child "fast feelings".
They do not occur very often at all (more so when I was younger, probably only once or twice a year now).
Its a symptom thats really hard to explain but i'll try my best. Basically its a wave of adrenallin that feels my brain. However im not bouncing off the walls or breathing fast, or anything like that. I can feel my body and thoughts moving at normal speed but on a subconscious level it feels like everything is moving a mile a second.
For example, if I move something in front of me, I know logically that it is moving at normal speed and I can even see that it is, but psychologically it feels like a huge adrenalin rush where everything is moving with great urgency.
The only thing that I can think of when linking the each experience is when im concentrating on something particular (often when I am drawing).
I am not worried at all about it - watching tv, or reading usually stops the feeling in a few minutes, and its not frequent at all. I was just curious if anybody had similar symptons or could tell me what it could possibly be.
I hope I explained it well enough, like I said its a very strange feeling to explain."
There are dozens of posts on this thread - all saying they have experienced this too.