Opisthotonus by Charles Bell
"From that moment the screaming began that continued for three days, and was so terrible that one could not hear it through two closed doors without horror. At the moment he answered his wife realized that he was lost, that there was no return, that the end had come, the very end, and his doubts were still unsolved and remained doubts.
"Oh! Oh! Oh!" he cried in various intonations. He had begun by screaming "I won't!" and continued screaming on the letter "O".
For three whole days, during which time did not exist for him, he struggled in that black sack into which he was being thrust by an invisible, resistless force. He struggled as a man condemned to death struggles in the hands of the executioner, knowing that he cannot save himself. And every moment he felt that despite all his efforts he was drawing nearer and nearer to what terrified him. he felt that his agony was due to his being thrust into that black hole and still more to his not being able to get right into it. He was hindered from getting into it by his conviction that his life had been a good one. That very justification of his life held him fast and prevented his moving forward, and it caused him most torment of all."
From 'The Death of Ivan Ilyich
By Leo Tolstoy