on top of the world
happy
have a whale of time
have a fun time / enjoy yourself very much
keep your hair on
keep calm
thrilled to bits
very excited
spaced up
daydreaming
cut up about something
sad/disappointed
get cold feet
change your mind / have a second thought
Head over heels
in love
dead on your feet
extremely tired
don’t know where to put yourself
embarrassed
banging your head against a brick wall
frustrated
butterflies in your stomach
nervous
taken aback
very shocked
got a screw loose
mad/crazy
makes your blood boil
angry
get under someone skin
annoy someone