Country star Billy Ray Cyruswas already panicking about his dwindling finances before things went south with Firerose—according to insiders, who say the singer’s terrified that divorce No. 3 will drop him further in a money hole, RadarOnline.com can reveal. A source revealed: “He lost $10 million last year, not to mention all the money he probably blew while he was married to Firerose, so he desperately needs to find a way to raise some cash ASAP.” The 62-year-old Achy Breaky Heart star pulledthe plug on his seven-monthmarriage to the 36-year-old Aussie songbird in May. He asked for an annulme…