This message is from 'Abdul 'Aziz Bin 'Abdullah Ibn Baz to the honorable brother. May Allah protect him! Assalamu 'alaykum warahmatullah wabarakatuh (May Allah's Peace, Mercy, and Blessings be upon you!)
I would like to refer to your question registered at the Department of Scholarly Research under the number: (2610), dated 4/7/1407 in which you mentioned your mother's state of forgetfulness after undergoing a cystectomy operation and wanted us to guide you to the Shar'y (Islamically prescribed) treatment for her condition.
What happened to your mother is decreed and preordained by Allah. A Muslim should be patient and hope for reward from Allah in compliance with the Words of Almighty Allah
but give glad tidings to AsSâbirûn (the patient). Who, when afflicted with calamity, say: "Truly! To Allâh we belong and truly, to Him we shall return." They are those on whom are the Salawât (i.e. who are blessed and will be forgiven) from their Lord, and (they are those who) receive His Mercy, and it is they who are the guided ones.
"Verily, greatness of reward is with greatness of trial. Indeed, when Allah loves a people, He afflicts them (with calamity). Whoever is content (with Allah's Decree), will win His Good Pleasure, and whoever is discontent (with Allah's Decree), will earn His Wrath." (AlTirmidhi ranked it as Hadith Hasan [good Hadith])
We recommend you to recite over her (for healing) Surah AlFatihah, AyatulKursi (the Qur'anic Verse of Allah's Chair, Surah AlBaqarah, 2:255), Surah AlIkhlas Say (O Muhammad ﺻﻠﻰ ﺍﷲ ﻋﻠﻴﻪ ﻭﺳﻠﻢ): "He is Allâh, (the) One. Surah AlFalaq Say: "I seek refuge with (Allâh), the Lord of the daybreak, Surah AlNas Say: "I seek refuge with (Allâh) the Lord of mankind, as well as other Ayahs from the Noble Qur'an.
"Adhhib ilba's Rab a lnas, waashfi, anta AlShafi, la shifa'a ila shifa'uka, shifa'an la yughadir saqaman [Remove the sickness, O Lord of mankind, and grant healing for You are the Healer. There is no healing but Your Healing, a healing that leaves no ailment]."
"Bismillahi arqik min kuli shai'in yu'dhik, min shari kuli nafsin aw 'ayn hasidin, allahu yashfika, bismillahi arqik [In the Name of Allah, I perform Ruqyah (reciting Qur'an and saying supplications over the sick seeking healing) for you (to heal or protect you) from everything that is harming you, from the evil of every soul or envious eye. May Allah heal you. In the Name of Allah, I perform Ruqyah for you]."
We also recommend that she sees a specialist, especially those who performed the operation as they might find a cure for her. May Allah guide us to that which pleases Him. May He grant your mother recovery and may He grant us all good health! He is the AllHearing and Responsive! Assalamu 'alaykum warahmatullah wabarakatuh.