I feel calm relaxed and peaceful.

我感到精神放松、平静。

youdao

I also have a personal rule that stops me from reacting to any problems until I feel calm about it.

我还有一条个人原则，即头脑不冷静时不处理问题。

youdao

Sometimes I would relieve my pressure by drinking and let off my emotions by playing interesting games. When I feel calm, I can deal with those pressures well.

我会先喝酒来纾解压力，并找些轻松的游戏来转移我的情绪，当情绪压抑下来再处理那些压力。

youdao

There are days I feel like an old woman, and I find that death is a calm and familiar presence.

NPR: First Listen: Laura Gibson's 'Beasts Of Seasons'

''I add to that advice, ''Even if you don't feel calm, pretend you are.

FORBES: Magazine Article

And the peace and the sense of calm that just automatically overtakes us makes me feel so happy, I don't how else to describe it.

NPR: What's in a Song? 'Twilight'