I'm pretty sure I've gotten worse at writing. I've been having a hard time trying to put some thoughts into words. Maybe it is because this time it was something more personal than usual. So, I'll let the psalmist do the writing for me..

be merciful to me, O Lord, for I am in distress;

my eyes grow weak with sorrow,

my soul and body with grief.

my life is consumed by anguish

and my years by groaning;

my strength fails because of my affliction,

and my bones grow weak.

Is it possible to be as sad as the psalmist? I guess it wasn't only simple sadness, it was depression - confusion, fear and hopelessness together.

but I trust in you, O Lord;
I say, "You are my God."

my times are in your hands;
deliver me from my enemies
and from those who pursue me.

let your face shine on your servant; 
save me in you unfailing love

Is it possible to have faith like that of the psalmist? In such situations?

Be strong and take heart,
all you who hope in the Lord

Verses taken from Psalms 31.
The way to deal with fear, depression, hopelessness, is to accept that we are afraid, we are depressed, and we feel hopeless. After accepting the truth, we then can learn to depend on God. No one can pull themselves out of a sink-hole by their own strength. I know I've said it really simply, although it isn't that easy and straightforward. Honestly, I'm not really sure myself.
I just read a Walter Trobisch book (Love Yourself), hence the topic.

Depression is also a step to finding what we live for.