Help with a moody 11 year old

[daffodilbrain]

I have a moody 11 yr old DS. He is driving us nuts. Usually made worse by hunger or tiredness, it's like dealing with a stroppy toddler. Other times he can be so lovely and polite and funny. Any books or website dot advice we use to manage this behaviour.?

Placemarking as same problem!

I have a stroppy 10 year old ds. Asking him if this is a small, medium or big problem when he's in a paddy has helped a bit.

Also placemarking for other's advice!