noun. A person who fusses over trifles.

noun. A nervous, fidgety person.

noun. a person who thinks excessively about unfortunate things that might happen; one who is excessively concerned about matters of trifling importance.

noun. One who complains or fusses a great deal, especially about unimportant matters; a fusspot

noun. thinks about unfortunate things that might happen

"In the past, the President notoriously spent immense amounts of time poring over the, leading one exasperated congressman to describe her as a "fussbudget" (defined by the American Heritage dictionary as a "person who fusses over trifles."

kill-joy  party pooper  spoilsport  wet blanket  

fusspot  worrier  worrywart