Director Sam Taylor-Johnson feels "wrung dry" by her whirlwind experience with "Fifty Shades of Grey".
The film, which is releasing on February 13, is based on the erotic romance novel by British author E L James, reported People magazine.
"I'm literally going out of my mind. I have seen this film over a thousand times and... The nuances within - the tiniest shift, look, blink of an eye - can make all the difference and flip it into the wrong territory. It's like walking a knife edge," she said.
Taylor-Johnson, 47, said she has been breathless ever since she signed on for the project.
"The moment I stepped out of the meeting, I stepped onto one of those bullet trains. The doors closed and I couldn't get off. The speed, the velocity, was unbelievable. I need to get off and breathe and think about something else," she added.
