AvatarJacobAmanda Seyfried says she thought she had a brain tumorverified_publisherFox News - ByAmanda Seyfried has opened up about her mental health battle, saying she initially had fears she had a brain tumor. The "Mean Girls" star, 30, told Allure magazine that she has been taking anti-anxiety medication for her Obsessive Compulsive Disorder (OCD) since she was 19. “Yeah. I’m on Lexapro, and …