This is not my personal experience but I watched my mother go through deep depression on a number of occasions. You can only love and be with them, reason and life advice is worthless.
Cast adrift
Far from the shore
A rift in the Star Trek thing
My time line's not in sync anymore
Some days it seems I've lost my way
Some days, I don't know, it's hard to say
I'm played like a ball in
A restless sea
Pushed by the fates enveloping me
Laughed at by those little gremlins
Whose job makes ours tougher
Shadows on the edge of your mind
That thrive while we suffer
Don't tell me tomorrow's another day
And when the sun shines we'll go
Back out to play
Don't tell me life's a blast
And to savour each parsec while it lasts
I see the black cloud
That billows and flaps
And wraps us up
Tight as a shroud
I see the end
I see the deep
I see the release found in unsettled sleep
I know what it is to wither
To be afraid and alone
To stand there and dither
I know what it is to embrace the abyss
To step in the dark and not to resist
To close my eyes and swallow the draught
To enter the dream where those gremlins laughed
I know you know
That the end's down below
In a fathomless pit
Where the nightmares grow.
SE