The terrible 2's happening at 4?????

So I got to thinking today about the balancing act it takes to combine being a mum, with taking care of your little people, combined with looking after hubby (which often times substitutes for child #3!) plus adding in your own work, hobbies, interests and anything else you may like to do with your time... Since starting Zimmer & Jee I find numerous times a day I'm taking phonecalls or doing little bits and pieces on the computer....and suddenly it seems little Mr 4years has turned into the devil child. Is this just an age based thing, or is it because my time is that little bit shorter these days? Being difficult for the sake of it - anything I ask is greeted with "no" and stomping off to the bedroom, multiple toy throwings and screetching "i not like you anymore". I've taken away tv, favourite toys, favourite foods, done time out in the bathroom...nothing seems to be working. Plus little "mr clever" seems to have worked out that saying sorry make mummy happy...he creeps up so cuddly, says sorry, then asks for his toys back! Arghhhhhh So my task this week is to work out if this is a phase or something else, and work out a way to deal with it...whist keeping tabs on the website of course!