Read Dorothy Sayers, she's much more entertaining and easier to understand; this is my favorite book/essay of hers, a little similar to de Beauvoir's The Second Sex; same era at least.

http://www.amazon.com/Are-Women-Huma...dp/0802829961/

de Beauvoir and Satre were lovers.

Here's a overview/outline of "existential angst" :-) from a professor.

http://www.tc.umn.edu/~parkx032/XP89.html