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The term "doomsday" typically refers to a hypothetical scenario in which the world or human civilization faces catastrophic destruction or collapse. While such scenarios can be frightening for anyone, including children, it is important to remember that they are typically unlikely to occur and that there are many positive things happening in the world as well.
However, it is true that many people, including children, can experience feelings of depression and anxiety, which can be difficult to deal with. These feelings can be caused by a variety of factors, including genetic predisposition, life circumstances, and brain chemistry.
If you or a child you know is experiencing depression or other mental health challenges, it is important to seek help from a qualified mental health professional. There are many effective treatments available for depression, including talk therapy, medication, and lifestyle changes. With the right support and treatment, people can overcome depression and go on to live fulfilling and meaningful lives.