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thrilled to bits
extremely happy
on top of the world
extremely happy
on cloud nine
extremely happy
over the moon
extremely happy
in seventh heaven
extremely happy
get a (real) kick out of something
very much enjoy doing sth (informal)
do something for kicks
do sth because it is exciting, usually sth dangerous (informal)
jump for joy
be very happy and excited about sth good that has happened
be floating/ walking on air
be very happy about sth good that has happened
something makes your day
sth makes you feel very happy
out of sorts
slightly unhappy or slightly ill
down in the dumps
unhappy (informal)
it's not the end of the world
what has happened won't cause any serious problems
just grin and bear it
accept a situation you don't like because you can't change it
a misery guts
someone who complains all the time and is very happy (very informal)
sour grapes
being jealous about sth you can't have
puts a damper on
stop an occasion from being enjoyable (sometimes 'dampener' is used instead of 'damper')