"If he doesn't pick her, a later stage of grief is depression and then acceptance, " Schneider said.

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She cited examples of therapists who had grown their business by positioning themselves as, say, specialists in helping modern families navigate digital media, rather than simply helping patients manage grief or depression.

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It may be difficult to distinguish between grief and major depression.

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Sarah Edwards explained to Fox News that eco-anxiety (manifested in feelings of fear, grief, anger, confusion and depression) caused her shoulder pain, fibromyalgia and fatigue.

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