You might be describing an adrenaline rush. It could explain your behavior. There are stories of people who were able to lift cars or do things that they otherwise could not physically do, or would not normally do, because of adrenaline. There is much research about the psychological impact of adrenaline. Here are some links where you can learn more about it:
When we feel threatened, we either go into a fight-or-flight mode. In 1914, Walter Cannon was the first to give a detailed explanation of the fight-flight reaction. He described it as an “emergency reaction that prepares an animal for running or fighting.” More current research has indicated that some people freeze or faint during these episodes. The stress hormone cortisol might explain why you were unable to relax even after the stressful experience had ended. Essentially, what happened to you could be explained by instinct and hormones.
I would recommend researching fight-or-flight reactions, human instinct, cortisol, and the psychological effects of adrenaline. It could help you understand what happened to you when you rescued your children from an attacking dog. Please take care.
Dr. Kristina Randle