Jean-Paul Sartre and Existentialism: groundwork for On Being and Nothingness

I think; therefore I am miserable.  To have my thoughts made manifest, would surely unleash my daily terrors.  Those would soon overfill the world proper.  Therefore, doubly so, again, I am made miserable.  -Elkind Vernon Sipp

 Does the the "malaise existentiale" evidence a tension between reality and the consciousness that forms the inner world?

"Couldn't I try?  Of course, it wouldn't be a piece of music--but couldn't I, in another medium?  It would have to be a book.

....I don't know quite which kind--but one would have to be able to suspect, behind the printed words, behind the pages, something that did not exist, which would be above existence.  It would have to beautiful and hard as steel and make people ashamed of their existence."

 -There Sartre playfully offers up an analogue to the creative process of writing something like On Being, while both dispatching and affirming the material of that important book.

What post-Enlightenment dignity, to positively sanctify or gold-plate ones own inner world as reality, and what a dangerous precipice on which to dangle the rest of the world, contending that to look at a work of art, the subject/object is made real, and when the head is turned, the eyes averted, the subject/object ceases to exist.

People who are too serious for empirical proofs might damage themselves in the pursuit of such proof, beginning to realize that if mama puts her hands over her face to play "pee-pie", her face is, for the elapsed time, utterly destroyed, but not in the mystical realm of Sartre's "nothingness", but somewhere else entirely that he can't quite touch:

reality,

and that is kept wholly separate as if not entirely broached by the being himself.

whereas, the true mystical nothingness of Sartre is a mistaken impression, but you don't know that, because you are, as he said, mistaken.  Therefore anything taken on cognitive terms is suspect, even as he argues for its sake.