Hi! I'm new here too. My son will be 7 in July and was diagnosed in May 2010 - so fairly similar.
He is on 2 injections a day of mixed insulin so think it is different but I find he can be going along at good levels then suddenly they go through the roof for a bit and then the next week at school he is suffering hypos mid-morning! I noticed a difference when we suddenly had a really cold spell the other week. I think with kids so much can affect them, happy, sad, stressed, worried, excited, growing, weather .... that sometimes it is really tricky to tell! I just tend to see how it is going for a week and then change his insulin and see if that works. I always think he seems to be a bit of the high side but at the moment his consultant is still happy with him so I try not to worry too much!
Hope you managed to get it back to normal x