Is it easy to change congregations if I want to?

You can change congregations if you want. You don't have to stay there. You've done everything you could to get rid of him and he's still there. So your anger didn't accomplish your goal. You may find that you don't need anger to be productive; it often gets in the way. What makes anger seductive is believing that it makes you productive when it doesn't. It's usually despite the anger, not because of it.

Anger does help you to focus better; in that sense, it can help you be more productive. When you focus better, you gain more power, for better and for worse. But when you focus your mind using anger, it has negative consequences. Your blood pressure goes up, your arteries constrict, your platelets become more sticky and are more likely to form blood clots, all of which can lead to chest pain or heart attacks. Meditation and prayer can provide the power that comes from being able to focus energy without the harmful effects that anger often brings.