Worrying: A Literary and Cultural History is a personal exploration by a certified grand worrier of how worry feels and how it is described in literature. I loved his description of worry as a loop, inescapable it seems, and only amplified rather than stopped by factual knowledge. He also points out that worry is a consequence of freedom of choice, as we worry that we did not choose the best alternative. Therefore, worriers do best as advisers, letting others make decisions.
Contrary to what one might expect, this is not a depressing book at all. Indeed, the author carefully delineates the border of worrying and depression: worry can be put into words; depression cannot.