By Tatiana Krisztina Michael Bolton has shared a health setback that he went through recently. The 70-year-old singer told fans about a recent surgery that is making him take a break from performing live. “Just before the holidays, it was discovered that I had a brain tumour, which required immediate surgery. Thanks to my incredible medical team, the surgery was a success,” he wrote on Instagram. “I am now recuperating at home and surrounded by the tremendous love and support of my family,” he added. Michael said in his note that for the “next couple of months” he would focus on getting better…