Prolonged Grief DisorderMeSH Descriptor

Severe and disabling grief reactions that do not remit in the 12 months after the death of a significant other. The core of the diagnosis includes persistent yearning or missing the deceased, and preoccupation with the circumstance of the death. (Carmassi, Clinical Handbook of Bereavement and Grief Reactions, 2018)
Prolonged grief disorder (PGD) is a disorder consisting of a distinct set of symptoms following the death of a loved one. PGD is experienced by about 10 percent of bereaved survivors, though rates vary depending on the circumstances. The affected person is incapacitated by grief, so focused on the loss that it is difficult to care about much else. He or she often ruminates about the death and longs for a reunion with the departed, while feeling unsure of his or her own identity and place in the world. The victim will develop a flat and dull outlook on life, feeling that the future holds no prospect of joy, satisfaction or pleasure. The bereaved person who suffers from PGD feels devalued and in constant turmoil, with an inability to adjust to (if not a frank protest against) life without the beloved (source https://en.wikipedia.org/wiki/Prolonged_grief_disorder).