An introspective examination on depressive feelings

When i feel depressed of late i discover its a sense of encroaching hopelesssness that is my downfall. A sense that there is no progression to life. a sense of stuck in a rut and eroding fast. i feel happiest when efforts seem to pay off, there is growth, progress, life, forward motion, i feel lowest when everything seems to be crumbling all around me. when efforts never seem to translate into reward when building that you work on all your life crumbles. the challenge is where do i go when all around me falls into the dust, where do I run? What then is my trust?