How can one get rid of the obsessions and fears concerning the emergence of chaos and the Antichrist (Dajjal) and the end of the world, which have affected my studies and daily life?

We advise you to turn away from obsessive thoughts and to busy yourself with learning, righteous deeds, and reading the biographies of the prophets and the Salaf. The cure for fear of the Dajjal is to seek refuge in Allah from him and to memorize the first ten verses of Surah Al-Kahf. The Prophet, peace and blessings be upon him, used to seek refuge from the tribulation of the Dajjal and commanded his companions to do so. It was reported from him: "When one of you finishes the last Tashahhud, let him seek refuge with Allah from four things: from the torment of Hell, from the torment of the grave, from the trials of life and death, and from the evil of the Masih Ad-Dajjal." And, "Whoever memorizes ten verses from the beginning of Surah Al-Kahf will be saved from the Dajjal."