Hi. I had Hyperemesis Gravidarum when I was pregnant with my girls. Lost heaps of weight & was vomotting around 17 - 18 times a day for 4 - 5 months.
I was admitted to hospital a few times & was given Maxalon, but I had a bad reaction to it, so couldn't keep taking it.
I've heard of Zofran, I think its used for anti nausea in Cancer patients (if I remember right) but my gp didn't feel comfortable trying it as it wasn't known then if it was safe in pregnancy. Things may've changed by now though.
Go see your gp. I really hope it doesn't last too long for you.