Reported by Al-Qasim bin Muhammad `Aishah (RA) said: "Oh, my head.'' (It was hurting due to pain.) Thereupon the Prophet (peace be upon him) said, "Rather it is I who says: `Oh, my headache.''' [Bukhari]. Commentary: one can express the intensity of pain provided that he has no intention to complain against the Will of Allah and point out his sorrow and frustration.
Riyad us Saliheen, Chapter 149, 916