Emmy Award-winner Christina Applegate has announced that she has multiple sclerosis, describing her diagnosis as a “tough road.” The 49-year-old actor known for her roles in “Married… with Children” and “Dead to Me,” said in a Twitter post late Monday that she was diagnosed “a few months ago.” “It’s been a strange journey. But I have been so supported by people that I know who also have this condition,” wrote Applegate. “It’s been a tough road. But as we all know, the road keeps going.” She added in a later post: “Now I ask for privacy. As I go through this thing.” Multiple sclerosis—also known as MS—affects the nervous system and often results in progressive physical and cognitive decline. More than 2.3 million people have a diagnosis of MS worldwide, according to the National Multiple Sclerosis Society. Nearly 1 million people over the age of 18 live with a diagnosis of MS in …