While her 1987 debut, “The Lion and the Cobra,” went platinum, Sinead O’Connor’s sophomore album, “I Do Not Want What I Haven’t Got,” gave rise to her Prince-penned mega-hit “Nothing Compares 2 U,” one of the most iconic songs of that decade. Over the last few years, personal trauma caught up with the artist. In 2016, she went missing and was found in Illinois by police. Then in 2017, she posted a very troubling video on social media about her mental health. After focusing on healing, she’s back, touring the states for the first time in almost six years.