The neurochemistry of the brain is astonishingly busy, the circuitry of a machine more wonderful than any devised by humans. But there is no evidence that its functioning is due to anything more than the 10(14) neural connections that build an elegant architecture of consciousness.
Antidepressants are very good, but it's a clinical cosh, really. Sometimes you have to be knocked out, just to stop; when you're in that state all you want to do is just sleep, and rest your body and your brain.
But he could not taste, he could not feel. In the teashop among the tables and the chattering waiters the appalling fear came over him- he could not feel. He could reason; he could read, Dante for example, quite easily…he could add up his bill; his brain was perfect; it must be the fault of the world then- that he could not feel.
Conscious attention is a designed function of the brain
which scans the environment for any trouble making changes.
If you identify yourself with your trouble shooter, then naturally you define yourself as being in a perpetual state of anxiety.