Stop Shouting!!!

This is one of those days when I doubt all my parenting skills... Mr Baby has a chest infection and we've been advised by the doctor to stay at home until he finishes his course of medicine, the first couple of days were ok but today Mr Toddler has pretty much shouted at me all day, demanded something, been rather mean to his brother as well as throwing various household objects around. After a good few hours of this I'm afraid I told him off (in the sense of using a very firm voice and the word NO), he calmed down immediately. This really worried me as I really wanted to go with the unconditional and non-judgemental way of doing things, but after a day of explaining things to him (if you push your brother it will hurt and he will be very sad) with him just getting worse, I just needed to say no.