Portland freelance writer Courtenay Hameister has suffered for most of her life with general anxiety disorder or GAD. Despite that she spent nine years as the host of the radio variety show “Live Wire” before stepping down for the sake of her mental health. Her new memoir, “OK, Fine, Whatever,” details her subsequent quest to confront her fears head on — resulting in experiences ranging from immersing herself in a sensory deprivation tank to a date with a polyamorous man at a sex club.