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Seven years ago, Mark Carnessale was diagnosed with oral cancer. He spent weeks in radiation therapy, losing his appetite and any semblance of a healthy sleep schedule. All night he would lay awake in his home in Burbank, gripped by fears about his own mortality.

Carnessale couldn't shake that anxiety, even after the cancer went into remission. He tried therapy and antidepressants, but neither did the trick; the fear of dying still clung to his brain.

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