As'alullāha ‘l-`Aẓīma Rabba ‘l-`Arshil-`Aẓīmi an yashfiyak.
I ask Almighty Allah, Lord of the Magnificent Throne, to make you well.
(Recite seven times in Arabic .)
Reference:
At-Tirmidhi, Abu Dawud. See also Al-Albani, Sahih At-Tirmidhi 2/210 and
Sahihul-Jami' As-Saghir 5/180.