getting angry with your kids!

Hey I was wondering what some Christian women have to say about how to deal with anger. I have been so irritable lately and my poor son is getting all of it from me and it's so unfair to him. I do the best I can to be a good mom but sometimes it feels like I just need a break cause I keep blowing up over little meaningless things... any advice on how to deal with this?? Thanks so much!