Childhood abuse is multilayered. Neglect and physical and sexual abuse are always accompanied by devastating emotional damage. This childhood abuse can appear as aggressive actions of harm as well as passive failures to act.
I believe a negative pattern of worry is established in childhood, based upon life circumstances, experiences, and perceptions. So, in order to find a way out, you need to be able to backtrack along your way in, to where worry started in the first place.
Anyone suffering from conditions such as depression, post-traumatic stress disorder (PTSD), and even eating disorders can attribute their feelings to mental health or behavioral issues. These types of mental health conditions can be treated using Cognitive Behavioral Therapy, or CBT, to help find the root of the cause.
Imagine being involved in a terrifying incident where you were physically harmed or threatened. Then imagine reliving that awful memory over and over again, each time as fresh and horrific as when it happened. This is the essence of PTSD.