IN OVER (MY/HIS/HER..) HEAD

English: I am in over my head.

Spanish: Esto es demasiado para mí.

Arabic:  الأمر أصبح فوق طاقتي

AS LIGHT AS A FEATHER

English: I am as light as a feather.

Spanish: Soy tan ligero como una pluma.

Arabic:  أنا خفيف كالريشة

ON PINS AND NEEDLES

English: She has been on pins and needles.

Spanish: ha estado en ascuas todo el día.

Arabic:  هي تنتظر على أحر من الجمر

BURNING THE CANDLE

English: She is burning the candle at both ends.

Spanish: está trabajando mucho sin descanso, toda la noche.

Arabic:  هي تعمل طوال الليل