It does feel to me to be one of the cognitive routes into a depressive state. A cluster of problems can overwhelm thinking and mood to such a deep level that it

It does feel to me to be one of the cognitive routes into a depressive state. A cluster of problems can overwhelm thinking and mood to such a deep level that it descends beyond reasoning. It's "analysis paralysis" that has worked its way deep into less rational parts of the brain to become a standard mode. Once your brain loses its sense of agency it just kind of collapses in on itself, stewing in an abstract gloop of impossibilities.