I had Hyperemesis last pregnancy and the only thing that helped was Diceglis. Zofran never did anything for me.
Mine wasn't as bad as yours but lemon water and 50mg of B6 daily helped almost knock mine out.
The lemon helps alieveiate nausea and the B6 did the same thing. My OB prescribe them to me to help because i was losing weight I was so nauseous.
I also found sipping Gatorade or sprite helped instead of water at time.
You're welcome glad it's helping