I went to the bathroom and I feel much better now.
この場合、次のような言い方ができますよ。
ーI went to the bathroom and I feel much better now.
「トイレに行ってスッキリした」
例:
I held my pee for way too long because I didn't have time to go. I finally went to the bathroom and feel much better now.
「トイレに行く時間がなくておしっこをかなり我慢した。やっとトイレに行ってスッキリしたよ」
to hold my pee で「おしっこを我慢する」
ご参考まで!