Authentic Supplication Number 150.

It is reported by way of `Uthman bin Abil `Aas that he complained to the Messenger of Allah  of a pain which he has felt in his body ever since he became a Muslim. So the Messenger of Allah  said: “Put your hand on that which hurts of your bosy and say Bismillah three times, and say seven times: ‘A`outhu bi`izzatil-lahi waqudratihi min sharri ma ‘ajidu wa’uhathiru (169).

(169) I seek refuge in the Glory of Allah, and His Ability from the evil of that which I experience and caution.

Reported by Muslim, and is #121 in The Authentic of Good Sayings.