. >> reporter: after dinah bazer was treated for ovarian cancer in 2010, the next two years were filled with dread. >> all i thought about was the cancer, that it would come back, and i would die of it. >> reporter: how severe was the anxiety? were you able to go on with your life? >> i felt like it was destroying my life. >> reporter: in 2012, entered a study to treat anxiety and depression in cancer patients using the hallucinogenic drug psyilocybin, the active ingredient in certain mushrooms. dr. stephen ross directs addiction studies at n.y.u. langone and lead the study. >> the idea was drugs, which were known to induce spiritual or these unusual mystical states of consciousness, might help people who were having this domain of distress. >> reporter: bazer took the medication in this treatment support. during the session, she saw her fear inside her body. >> and as soon as i visualized the fear, i became furious. in my mind i screamed, "who the hell do you think you are? i won't be eaten alive." from that moment, the fear was gone. >> reporter: you took control. >> i took control. a