A:
It is permissible to describe the Prophet as "The One Removing the Grief". Allah has saved people by him from Hell-fire and led them from the darkness of disbelief and polytheism to the belief in His Oneness. Describing His Prophet (peace be upon him), Allah (Glorified be He) says:
Alif-Lâm-Râ. [These letters are one of the miracles of the Qur’ân, and none but Allâh (Alone) knows their meanings]. (This is) a Book which We have revealed unto you (O Muhammad صلى الله عليه و سلم) in order that you might lead mankind out of darkness (of disbelief and polytheism) into light (of belief in the Oneness of Allâh and Islâmic Monotheism) by their Lord’s Leave to the Path of the All-Mighty, the Owner of all Praise.
And:
Indeed Allâh conferred a great favour on the believers when He sent among them a Messenger (Muhammad صلى الله عليه وسلم) from among themselves, reciting unto them His Verses (the Qur’ân), and purifying them (from sins by their following him), and instructing them (in) the Book (the Qur’ân) and Al-Hikmah [the wisdom and the Sunnah of the Prophet صلى الله عليه وسلم (i.e. his legal ways, statements, acts of worship)], while before that they had been in manifest error.
However, "The One Removing the Grief" does not mean that he (peace be upon him) removes distress. People must not seek his help instead of or along with Allah as this is regarded as major Shirk (associating others with Allah in His Divinity or worship), which Muslims should be aware of.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.