Memory loss is a long-observed symptom of depression. Stress and anxiety has been shown to cause the hippocampus to shrink, and it is the part of the brain believed to be responsible for forming memories.
A related theory I see is the minds of those who suffer from Major Depressive Disorders effectively 'train' themselves to focus on the negative beyond our natural propensity to quickly form strong memories of negative experiences. The mind makes 'neural pathways' and they get stronger the more they are used, this is how memories are formed.
It's theorised that having more negative experiences makes recalling them require less effort to recall, at the expense of the formation of other memories—it takes up more space and creates 'traffic'.
Having ptsd, depression, anxiety, and trauma worsens the memory. I also can't retain information and I rely on others for help, so it's very hard for me to be a normal functioning adult. How the hell am I supposed to survive out here? I can recall some of my childhood memories, but I remember most of the times when I felt immense pain and sadness. It's just not a quality life
