Depression is, basically, as much as a
disease of the
mind, a
problem of the
soul. Out of all the
metaphors and
similes I've seen for depression, the most
accurate would probably be a
dark grey cloud, or
fog. Depression
dulls edges,
shrouds the world, and
isolates you from everything
around you.
Other good descriptions: a weight around your neck, apathy of the soul, wanting to sleep and not wake up.
On a more advice-like note, depression is, for most people, not something to be dealt with alone. Depression is an illness. It can be diagnosed, treated, and cured. It can be fought. Be strong, and get well.