Is there a proper name for my recent experience?
Common signs of depression:

---> Decreased Interest or Pleasure

The second core symptom of major depressive disorder is a decreased interest or pleasure in things that were once enjoyed. A person exhibiting this symptom will show markedly diminished interest or pleasure in all, or almost all, daily activities.

---> Disengaged

A developed practice of being distant or disengaged, uninvolved with things that usually matter, negligent towards loved ones.

Depression can be dangerous, do not take it lightly and seek proper medical support is also a preferred way.