Hi all,
thank you for all your suggestions. It's taken a while but i think i have got to the root of the problem.
He had a clash of personalities with his new childminder.
Although he did have a stomach upset which added to it, it seems he wasn't getting along with the new Childminder. I have reduced my hours at work and after a week of me taking both my children to school and picking them up, we are back to clean days and nights. :-)
It means a complete overhaul at home, as now that i have reduced my hours at work i can't afford my home (i'm a single parent.) so i'm now looking to move to a cheaper area, but if in the long run it means all of my children are more settled then it will be worth it.
Thank you all once again for your suggestions
elou x