Even someone with a strong sense of identity can begin to question who they are during or after times of transition or significant life changes or events. Sometimes it can be a sudden and unexpected event, like an accident or an illness that can cause you to question yourself. Other times it can be a layoff after years in the same job, a divorce or the death of a loved one. Whatever the cause, the person now finds themselves questioning their identity, who they are.
For example, a person who has survived an accident or severe illness may find themselves questioning everything about themselves: career, relationships even religion.
Someone who finds themselves newly divorced or no longer has their children living with them may suddenly not know what to do with themselves because they feel that they have lost a large part of their identity. There is no quick fix for this, only the opportunity to explore yourself on a deeper level, and possibly come out on the other side of it a healthier and happier person.