Michael Boltonalready had a health scare in the new year. The 70-year-old musician was diagnosed with a brain tumor before the holidays and underwent surgery,RadarOnline.comhas learned. The When a Man Loves a Woman singer will be taking a break from touring to recover. Bolton announced the news on his social media Friday. “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,” he began. “Just before the holidays, it was discovered that I had a brain tumor, which required immediate surge…