30 minutes facing a wall is verging on child abuse! I wouldn't even do that to a child at primary school.

I too am the mother of "that child" (you know the one always hitting etc) I have actually modified DS's diet as per the list of additives and preservatives NOT to eat on the Failsafe website and have found that it made an enormous difference. I sure it won't work for everyone but its amazing the difference it has made to Riley so maybe give it a go.