Hi has become addicted to tech / Tv, ignores when I say not to do something and has started giving me lots of cheek. Earlier I was making him supper, and said, 'mind out, move over there x, I have a sharp knife' (I was making cheese sandwiches at the time), he didn't move and instead said 'what about the knife?' i'm afraid this really triggered me and i put the knife down and turned around and yelled in his face and sent him to his room.I apologies later, but I'm afraid to say I feel regularly out of control with him lately. I am actually scared at the damage I might be doing by yelling at him. I can't stop. I don't know where to turn for help.