TO DROWN IN SOMETHING
TO STRESS OVER SOMENTHING
RATTY
TO STRESS YOURSELF OUT
TO BE AT YOUR WITS' END
DISTRESSED
to feel stressed because you have too much of something bad or stressful, such as work
to experience mental stress about something
to be so worried and tired because of your problems that you can't think of any more ways of solving them
to feel very nervous and worried
upset or worried
feeling annoyed, irritable