What is the ruling on working for a sorcerer or similar individual to separate two people who are not permitted to marry, especially given that one of them loves the other to the point of mental illness?

It is not permissible to practice magic; it is forbidden and a major sin. The Prophet, peace and blessings be upon him, disavowed those who engage in it.

If the young man is suitable for marriage, there is no impediment to your marriage. However, if marriage is not in your best interest, your attachment to him will only increase your suffering.

You need to be strong and turn to Allah to rescue you from your current situation. Do not go to a sorcerer, as this will corrupt your faith and escalate your problems.

One of the most important things that will help you overcome this attachment is to marry the first righteous man who proposes to you. There is no harm in seeking help from close relatives to find a righteous man.

There is no objection to seeking assistance from a ruqya practitioner, and you should increase your remembrance of Allah. We ask Allah to guide your heart and heal you.