"Obsessive worrying" is the best way I can describe it I guess.  An example for me is climate change.  Sometimes I spend hours reading news articles about climate change, fall into paralyzing existential dread, start thinking...should I hoard bottled water in case of drought?  Where can I move in the world that will be most protective?  etc.  Another example is nuclear war.  Sometimes I get really hyper fixated on that too.

Anyone else relate?