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All answers having "Don't Worry" as clue:

3 Character Answers:

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ONO



4 Character Answers:

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IMOK



5 Character Answers:

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ITSOK



7 Character Answers:

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CHEERUP

FEARNOT

ITSFINE

ITSOKAY



9 Character Answers:

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SLEEPEASY



10 Character Answers:

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EARLWEAVER

HEWONTBITE

ITWONTRAIN

WELLMAKEIT



11 Character Answers:

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RESTASSURED



15 Character Answers:

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NOCAUSEFORALARM