I have had prolonged episodes of depression since age 19. (I'm now 74.) The principal symptom I experience never appears on any of the standard lists of symptoms. I describe this symptom to my psychiatrist and therapist as a continuous feeling of being drugged, sedated, foggy. I experience the world through a sort of haze, as if I were partially anesthetized. This is not the "brain fog" usually described as affecting memory, thinking ability, or concentration. I can function quite normally but have constantly to "push through" this haze. It takes all the fun freedom out of life. My doctors assure me that this is the way I experience depression. (My scans and MRIs check out fine.) I'm interested to know of other who experience a similar symptom.