“I was in tears, and my head was spinning”: Angelina Jolie admitted she couldn’t hold it together.

The 49-year-old Oscar-winning actress stars in Pablo Larraín’s film “Maria,” which depicts the final days of the renowned Greek-American opera singer Maria Callas, who suffered a fatal heart attack in 1977 at the age of 53. To prepare for her role, Angelina dedicated herself to improving her vocal skills, undergoing seven months of intensive training. …