Compassion fatigue has the following four stages.
Zealot phase. A person is passionate and excited about work. They may go above and beyond to show their commitment and eagerness to excel.
Irritability phase. Feelings of enthusiasm start to wane, followed by avoiding work responsibilities. While still performing in their care-taking role, their commitment to quality work declines, and they become more careless and make mistakes.
Withdrawal phase. No longer feeling passionate about work, the line between personal life and care-taking responsibilities blurs. The lack of clear boundaries results in irritability towards and about those being cared for and totally detachment from the helping role.
Zombie phase. The caregiver continues to distance themselves from those they take care of and sink into a depression. They may feel despondent and angry, and project this onto coworkers, viewing them as incompetent.