Anti sickness meds?

How does everyone feel about taking anti-sickness meds during first trimester? I'm 8.5 weeks and i've been having multiple vomits daily and non-stop nausea (couldn't keep anything down yesterday until the afternoon), so the Dr prescribed me Prochlorperazine (Stemetil) yesterday. My fiancé is quite anti me taking this as he thinks it's not natural and wonders if it will have a negative effect on the pregnancy. Saying that, it has made me feel so much better and i haven't been sick so far today. Does anyone have any experience with this medication?