nothing to worry about

:  not any thing :  no thing

:  no part

:  one of no interest, value, or consequence

:  not at all :  in no degree

:  something that does not exist

:  the absence of all magnitude or quantity

:  zero

:  of no account :  worthless

:  choke, strangle

:  to harass by tearing, biting, or snapping especially at the throat

:  to shake or pull at with the teeth

:  mental distress or agitation resulting from concern usually for something impending or anticipated :  anxiety

:  an instance or occurrence of such distress or agitation

:  a cause of worry :  trouble, difficulty