Imagine Dragons Frontman Dan Reynolds Opens Up About 'Debilitating' Chronic Disease: 'I Couldn't Perform'

Eight years ago, Dan Reynolds was on the cusp of stardom -- but his health was in turmoil. Reynolds, the frontman of Grammy-award winning band Imagine Dragons, tells PEOPLE that at age 21 he began to experience "debilitating" pain that forced him to cancel shows. "It was beyond the pain that you feel when it's just a back ache. It felt like someone was drilling my nerves," he says. "It was right when the band was starting to have minor success -- we were starting to sell out small clubs, and we ...