Usman ibn Abil Aas As-Saqafi (R) complained to Nabi (Sallallahu Alaihi Wasallam) of a pain that he felt in his body. Thereupon Nabi r said: “Place your right hand at the place where you feel pain in your body and say (7 times):

أَعُوْذُ بِعِزَّةِ اللهِ وَقُدْرَتِهٖ مِنْ شَرِّ مَا أَجِدُ وَأُحَاذِرُ

I seek refuge with Allah and with His Power from the evil that I find and fear. (Ibn Majah/Muslim)