The psalmist pleads with God. He brings his light and truth through his Word and his presence, which are the best way out of depression.
Because we are assured of eternal life in heaven, we can endure anything in this temporal life on earth. When we know our end is glorious, we can joyfully and willingly live for him no matter what our circumstances. This is true comfort, and it is unchanging.
Facing traumatic loss is about keeping our sanity and taking care of those who depend on us, all the while deciding how we are going to face this new unwelcome reality. I learned at so many points that I had to look straight at the loss or I could not find comfort.
Our mental, emotional, and spiritual health need rest. We need to care for these areas with the fight and dedication that we take care of our physical health.