Assalamu alikum

My cousin is pregnant and she is saying that there is something sitting on her back and every time she eats something she feels someone hitting her back and then she vomits. Before she got married she had a dream of a black figured saying to her "you'll never get married and if you do then i'll bring you misery and pain!" we believe that she might be possessed, what is happening to her?

It sounds like she is pregnant and having some pains and other complications from the pregnancy. It sounds like she needs a proper medical exam and treatment.