Robert De Niro at the Oscars:
“The mind of a writer can be a truly terrifying thing. Isolated, neurotic, caffeine-addled, crippled by procrastination and consumed by feelings of panic, self-loathing and soul-crushing inadequacy. And that’s on a good day.”
Marlene Dotterer 
Hey, I resemble that quote lol!!!
So true, but he left out ‘guilt’. We writers feel guilty whenever we didn’t write enough words/pages on a given writing day.