worrywart

noun

1. A person who worries excessively, especially about unimportant matters.

   “It doesn't mean you're a worrywart, a nervous wreck or in need of heavy medication.”

   “On vacation, I'm a worrywart for fretting about third-degree burns and puncture wounds.”

   “When Biden takes the presidential oath in January, many will write articles scolding those who expressed concern about a coup as worrywarts, or as people misusing terminology.”