If I can't get my hair just right in the morning, I don't feel quite settled the rest of the day.
この場合、次のような言い方ができますよ。
ーIf I can't get my hair just right in the morning, I don't feel quite settled the rest of the day.
「髪型が決まらないと、その日1日気分が落ち着かない」
can't get one's hair just right で「髪型が決まらない」と言えます。
ご参考まで！
カナダ 
