@Hope:-)
Without knowing what medications you are currently taking its hard to give a particular reccomendation. In your case, it might be best to ask for an antiemetic, but not specify a particular type and leave it to your physician to determine what is best based on the medications you are taking.
Metoclopramide: You stated that there is a possible adverse reaction that can occur with another medication you are currently taking. Perhaps mentioning this medication to your doctor. He/she will be able to tell you the chance of the side affect, or be able to reccomend a biosimilar drug.
Prochleperazine: You state that you are currently on an antipsychotic drug. Being that prochleperazine has many antipsychotic traits, there is a very high chance of this drug having an adverse effect.
Domperidone: This medication is very different than most other antiemetics. Doperidone works by triggering contractions in the stomach and intestinal track. It is typically reserved for use in tandem with other drugs which can trigger stomach irritation. Antiemetics such as metoclopramide, work by inhibiting signals from the brain which trigger the nerves controlling muscles that are used in the regurgitating process. Here is a link to a recent megathread post on this drug, explaining it in more detail.