Normal symptoms of grief include:

  •  Numbness
  • Attacks of yearning and anxiety alternating with longer periods of depression and despair

  • Preoccupied with thoughts of the dead one

  • Insomnia

  • Anorexia

  • Irritability

  •  Social withdrawal

A person with chronic grief experiences and displays all the symptoms of normal grief, but the symptoms are more pronounced and may be more prolonged.

This article has some very interesting information about Chronic Grief and the factors that may cause it:

A Systematic Review of the Literature on Complicated (/Chronic) Grief: