I wanted to put this out there as I just learned about it. My 7 year old had been exhibiting extreme anger / rage / emotional lability issues for some time. My older daughter had had the same issues when she was younger, and when we got her off gluten, they completely turned around.
We were hoping that if we did the same for my younger daughter, it would help, but it didn't. We tried all kinds of various things that we were hoping would help but none did. Finally, my LLND suggested she might have yeast issues. So we did a test, and it came back positive. She's been on essential oils pills we got from a compounding pharmacy for 3 weeks, and she's made SUCH amazing improvements.
Where she would once wake up on a school morning and cry, rage and tantrum from the moment she woke up until we dropped her off at school over anything and everything, now she wakes up, gets ready for school, and many mornings there's no crying at all.
In case you're experiencing anger / rage (or your kids), and haven't been tested for yeast, it might be what's going on.