How to describe happiness with idioms?

be as happy as a lark

I'm going crazy.

Become very conceited

Show an angry expression

clap one's hands and laugh aloud

cheer up

Feel happy after a long time of compression

be full of joy

be filled with exultation

Happy to the extreme.

A contented mind is a continual feast.

If you don't have what you need, you can download a software called Idiom King to classify idioms. There is a big category of "emotions" and a small category of "happiness" below. You can tell at a glance. I wish you happiness!