How do I control a game and its emotions without getting overwhelmed?

Keeping control of a game and the emotions running through it feels like too much because you are trying to manage everything and everyone at once. That is an impossible standard. You cannot control how people feel. You can only control the game and yourself. The overwhelm eases when you narrow your job. You are not responsible for calming every temper or pleasing every side. You are responsible for making fair, clear decisions and keeping the game moving. Let the emotions be what they are. Your calm and consistency are what slowly bring the temperature down. Focus on one thing: your next decision, made clearly and without wavering. Then the next. When you stop trying to hold the whole emotional weather and just call the game well, one moment at a time, the overwhelm loses its grip. Steadiness is your job. The rest follows from it.