Wow. For an unusual syndrome, there sure are a lot of people who suffer from it. I have also felt it and also not been able to describe it accurately without people thinking I am tripping on acid at that time. I ALSO started feeling it when I was little - while feverish. But I've had it enough times as an adult to not be able to discount it as a childhood thing only. And, additionally, I have had the feeling while driving, pretty much the same as described above.

My feeling tends to range, though, from my head and hands and arms feeling way too big (like a balloon) to sometimes very small (like twigs).

At 19 (16 years ago) I had the first of my (so far) 6 tonic-clonic seizures and have since associated any weird brain things with those. I guess I should rethink that...

It sure is interesting to find out how many other people have had this feeling!