Can a soul attached to a person cause an impediment in their marriage affairs, and how can the afflicted person treat themselves from this without resorting to sorcerers?

You have done well in refraining from going to sorcerers and magicians, for the Prophet, peace and blessings be upon him, said: "Whoever comes to a soothsayer or a diviner and believes what he says, has disbelieved in what was revealed to Muhammad, peace and blessings be upon him." Hold fast to Allah, and frequently remember Him, thank Him, obey Him, and recite the two Mu'awwidhatayn (chapters of refuge). Beware of sins and transgressions. I advise you to perform Ruqyah (exorcism) on yourself according to Islamic law.