Billy Ray Cyrus filed for divorce in May, but his estranged wife, Firerose, recently accused the country star of “extreme” domestic abuse. In a complaint filed by Firerose’s attorney, the songstress claimed she “walked on eggshells” around Cyrus, as he placed her in “into an emotional and psychological prison.” “When Wife would attempt to voice certain concerns, Husband would often call her a ‘selfish f—— b—-’ and continually alleged that she was using him,” the documents read. “With Wife’s major surgery date looming, she was reasonably afraid to leave or seek any type of help because she fe…