Michael Bolton has revealed he was diagnosed with brain cancer and underwent “immediate surgery” just before the holidays. Bolton, 70, who made an appearance on The Masked Singer last year took to social media on Friday and opened up about his health. The When A Man Loves A Woman singer explained he was now “recuperating at home” and was surrounded by his supporting family. He wrote on Facebook: “I want to start by wishing everyone a very happy and healthy new year! “I also want to share that 2023 ended up presenting me with some very unexpected challenges. “Just before the holidays, it was di…