(CNN) Emily Gavigan was convinced that a nearby truck was following her. Emily Gavigan began exhibiting odd behavior when she was 19, which doctors mistook for a mental illness. There are over 15 known types of autoimmune encephalitis, according to the Autoimmune Encephalitis Alliance. Emily Gavigan, left, said she wouldn't have survived her autoimmune disease if journalist Susannah Cahalan hadn't told her story publicly. "If she wasn't able to tell her story, then I wouldn't have gotten a diagnosis," Gavigan told CNN.

Source: CNN August 29, 2017 08:09 UTC