Now that the initial shock of the attacks has worn off, many people are feeling a new emotion: survivor guilt.

CNN: Recovery: Insurance industry seeking assurance

Now safely at home recovering, the 27-year-old securities broker is struggling with an emotion shared by perhaps thousands of others: survivor guilt.

CNN: Recovery: Inklings of economic optimism

He grappled with survivor's guilt, the images he saw but didn't share and the anxiety about how his work affected other people's lives.

CNN: Neda: Latest iconic image to inspire