One chronic source of anxiety for a leader is doubt: doubt in yourself or doubt in God. Who is to say which is the worse form? My vote goes to doubt in God.
When a leader has to lead a community of faith while her or his own faith is either shifting or crumbling away, it can add significant anxiety to an already pressured role.
One source of leadership anxiety is a phantom strike. This is anytime one person takes a shot at you, but they are carrying a secret hidden army with them. It is any variation of “me and a bunch of people who aren’t here and who I won’t name all think there is something wrong with you.”