What is the ruling on seeking a cure for a severe illness by committing an abomination, while detesting the one who commits it?

Allah does not ordain healing through what He has forbidden, so abandon thoughts of committing indecency. The Healer is the Lord of the worlds, for He, the Most High, said: "And when I am ill, it is He who cures me." The Prophet ﷺ used to supplicate for the sick, saying: "Remove the suffering, O Lord of mankind, and heal, for You are the Healer. There is no healing except Your healing, a healing that leaves no sickness." Therefore, turn to your Lord and ask Him for healing, and ruqyah (Islamic incantation) is beneficial by Allah's permission.