What is your advice to someone who is experiencing doubts about the prophethood of Muhammad (peace be upon him) and consequently losing focus in their studies?

"Obsessive-compulsive disorder (OCD) does not form the basis for Islamic rulings such as divorce or apostasy. Allah has pardoned this nation for what their hearts whisper, as long as they do not act upon it or speak of it. These whispers may indicate strength of faith and Satan's eagerness to mislead you. The cure lies in seeking refuge with Allah, refraining from indulging in these whispers, turning away from them, and occupying oneself with the remembrance of Allah and sending blessings upon the Prophet (peace be upon him). We advise you to recite the Quran frequently, engage in righteous deeds, seek refuge with Allah, and supplicate to Him."