Dark night of the soul
There are moments in life where nothing seems to make sense any more. It is as if the very foundations of life as we know it have collapsed. There's a tremendous sense of loneliness, of despair... so intense that it would feel trivial to just call it "depression". From that place, it feels impossible to ever experience hope again.
And yet, even in these dark moments, there is still some energy that we can ride, if we look for it where it is - - in the physical experience itself. See: Felt sense as a moment-by-moment experience.