Jamie-Lynn Sigler is opening up about a deeply personal chapter of her life, revealing that her years on The Sopranos —the role that made her a household name—were also the most difficult period she’s ever endured. In her upcoming memoir And So It Is…: A Memoir of Acceptance and Hope , the 44-year-old actress reflects on the emotional and physical struggles she faced behind the scenes while portraying Meadow Soprano. Despite the show’s massive success, Sigler describes that decade as “the most difficult 10 years of my life,” marked by an eating disorder, a hidden diagnosis of multiple sclerosis (MS), and a controlling marriage that was unraveling at the same time. Sigler was just 16 when she stepped into the spotlight in 1999, quickly becoming part of one of television’s most influential dramas. But as her profile rose, she says her personal life was spiraling.…