Addiction sneaks up on pain patients in the worst opioid epidemic in U.S. history, and their shared battles for recovery are fraught with ironies, tragedies and sometimes shaky success. Survival means rejecting powerful painkillers and finding safer relief. For some that’s anti-addiction medicine similar to pills that brought them to the brink. This is a snapshot of those in the trenches of America's addiction crisis. More than 2 million people are hooked on opioid painkillers and more than 15,000 of these users each year don't make it. Even for those who do, success never quite seems lock-tight.