Is it permissible to supplicate for healing from a chronic, medically incurable disease? Is this considered an excess in supplication? What is the answered supplication? And what is the authenticity of the supplication in Salatul Hajah (Prayer of Need): "O Muhammad, I turn with you to my Lord for this need of mine..."?

Asking Allah for healing is not considered an act of aggression in supplication; rather, it is permissible and religiously encouraged. There is no specific supplication that is answered quickly, but fulfilling the conditions for acceptance and avoiding its impediments, coupled with drawing closer to Allah through acts of obedience, increases the speed of the response. As for the supplication of Salat al-Hajah (Prayer of Need) and intercession through the Prophet, peace and blessings be upon him, the correct form of Salat al-Hajah has been clarified. The Hadith of the Blind Man is specific to the life of the Prophet, peace and blessings be upon him, according to the preponderant opinion, and the wording mentioned in the question has been deemed weak by some scholars. It is advisable to be patient, content, and to supplicate while seeking out times when supplications are likely to be answered.