Do physical symptoms (such as pain in the stomach and chest, lethargy, fatigue, and poor appetite), disturbing dreams (such as being chased by a donkey, a snake bite, and intercourse with a woman), and marital problems indicate the presence of black magic that has been drunk, and how can it be treated?

What you are feeling might be due to the evil eye or sorcery. Therefore, take the legitimate means of treatment by staying away from sins, striving in obedience to Allah, and performing ruqyah (Islamic exorcism), while being wary of sorcerers and charlatans. The best protection is adherence to obedience to Allah, maintaining remembrance (dhikr), staying away from sins, and consistently performing protective invocations. To confirm the presence of sorcery, refer to trustworthy practitioners of ruqyah, not just anyone who claims to be one.