Hello,
My son was diagnosed 4 weeks ago, just 2 weeks before his 7th birthday.
The hardest thing about it all is his behaviour. He's normally a sweet caring boy so it's quite a shock when his behaviour changes all of a sudden.
Similar to yourself, I find when his levels are moving fast - up or down - he then acts in this way.
It's not every time though, sometimes he acts perfectly fine when the levels move rapidly. I think another factor is also in play, I'm not yet sure what but I think it might be tiredness.