What is the supplication that begins with "O my intimate companion in my loneliness, O revealer of my distress," and is it authentically reported from the Prophet, peace and blessings be upon him, or from one of the Companions or their successors?

The supplication mentioned, "O Allah, comfort me in my grave," was not reported from the Prophet, peace and blessings be upon him, or the Companions. Al-Albani ruled it to be fabricated. The door of supplication is wide for a Muslim to ask for whatever good he wishes in this world and the Hereafter, as long as it does not involve sin, severing ties of kinship, or polytheism. Nevertheless, adhering to theplications that have been transmitted (from the Prophet) is more preferable.