Hi Carameli, sorry there are no replies to your post...
I can't add much, just to let you know that my DS is also going to turn 3 in Dec, and has recently turned from a happy, chirpy little boy (unless hungry or tired, but always easily rectifiable) to a demon. No other word for it.
He does go to nursery, three mornings a week, where he is an angel, doesn't have any toilet accidents, helps out doing 'staff' jobs etc.
He comes home, throws stuff, screams, whinges, and generally is naughty and a handful . I wish I knew how to change it!
At the moment he's wrapping sellotape all round my dining room chair legs which is fine by me - picking my battles at the moment!
He used to be full time but has been part time for about 2.5 months now, he has a new baby due in about 4 weeks time and we're currently in the process of decorating a new bedroom for him so I'm hoping that things will settle down once the baby is actually here...
...alternatively, I'm hoping that this is 'just a phase' and that 'this too shall pass' - otherwise having DC No2 will turn out to be the biggest mistake I've ever made...
Nursery may help, apart from giving you a break, it may also help by giving him some mental / social stimulation that will 'stretch' him a bit. DS loves his nursery, but he's always gone to one (well, since 9 months) so he's kind of used to it!