When someone is struggling with mental illness there is a lot of "insecurity" and "fear" in them. So with that a person may make multiple threads in an attempt to reach out for help and guidance to better deal with their fears. Also, it's not unusual for someone to get stuck in "fight/flight" where they feel fear and then switch to anger.

Mental illnesses can most definitely get crippling for people to a point where they feel lost and even isolate themselves. We are constantly studying the brain and how to help those who struggle with mental illnesses in hopes to find ways to help them live their lives without the constant challenge with whatever their mental illness happens to be.