Nausea Meds (Diclegis, Unisom, B6)

Ann
So my nausea and vomiting are so bad and today my Dr. Hydrated me with IV fluids and gave me a prescription for diclegis. When I went to get it it was a copay of $530!!!!! The pharmacist told me the active ingredients are Unisom and Vitamin B6. So I bought both of those instead. Anyone know how much and how often to take?