What is the meaning of my feeling of fear and screaming in my heart whenever I pray, or read the Quran, or speak about Islam?

What you experience during prayer, reading the Quran, or discussing Islam could be a psychological or physical illness, magic (sihr), or intrusive thoughts (waswas). In all cases, you must turn to Allah through supplication, consistently perform acts of obedience, refrain from sins, and maintain your regular remembrance of Allah (dhikr). There is no objection to presenting your case to a specialist in psychiatry or physical medicine. Do not worry, for every illness has a cure. And the best cure, after seeking refuge in Allah, is to disregard these thoughts and persevere in worship.