If you feel overly anxious and worried, that is a sign of neurosis: a mental illness with no particular cause.
Depression, tension, irritability, and nervousness are all symptoms of a mental or emotional disorder called neurosis. When you have a neurosis, you worry so much that it makes life difficult. The difficult thing about neurosis is there’s not something specifically wrong, like with a broken leg or type of cancer. Neurosis is a mental-health issue that can be minor or very serious. It's also very common, and many comedians have made fun of their own neurosis in their work.