worrywart
From Longman Dictionary of Contemporary Englishworrywartwor‧ry‧wart /ˈwʌriwɔːt $ ˈwɜːriwɔːrt/ noun [countable] American English informalWORRIED someone who worries a lot about unimportant thingsExamples from the Corpusworrywart• Would he have figured that I was just being a worrywart?• Don't be such a worrywart!• The cast also included Norman Fell as the worrywart producer.