What is the reason for nausea and aversion to the Qur'an and nosebleeds when holding the Mus'haf, and must the fasts be re-observed for the days on which blood flowed and the validity of the fast was doubted?

To protect oneself from the evil eye and to maintain the memorization of the Qur’an, it is recommended to consistently recite the prescribed remembrances (adhkar), supplications for protection (ta’awwudhat), and perform ruqyah (definition) as legislated by Islamic law. One can benefit from specific advice for memorizing and solidifying the Qur’an, such as the book "How to Memorize the Qur’an" by Dr. Yahya Ghawthani and his lessons on "Creative Skills and Ideas in Memorizing the Qur’an." As for blood in the throat, it does not invalidate the fast unless it reaches the mouth and the fasting person intentionally swallows it.