Sometimes spiritual warfare affects several areas of life, and it seems hard to fight. I should not get stressed out about the whole thing. I should do what I can about what I can change.
In the story of the boy with the demon which could only be cast out by prayer and fasting, the demon came out and left the boy as if he was dead.
God had already given the disciples the authority to cast out demons. They needed to pray and stay close to God in order to use that power and authority. We lose two things when we are not close to God: vitality and humility.