What is the ruling of Islamic law on dealing with a case of demonic possession that is worsening, where the afflicted person sees and hears strange things, and receives threats and offers of fornication in dreams from a female jinn, and is it permissible to treat with ruqyah (Islamic exorcism) with the help of a Muslim jinn?

The patient is advised to seek Allah's help and rely on Him, and to recite frequently the legal invocations for protection, such as the Two Protectors (Surahs Al-Falaq and An-Nas), Ayatul-Kursi (the Verse of the Throne), and the prophetic invocations. The heart and tongue must align with sincere devotion to Allah when seeking protection. It is not permissible to seek the help of jinn for treatment.