First, lots and lots of sympathy! I’ve had two Hyperemesis pregnancies, and they were the grimmest times of my life.
Are you managing to stay hydrated? That is the most important thing. When I was so sick and pregnant, I couldn’t keep down water, but I could just about manage ice lollies - only lemon ones though.
There are other anti sicknes meds you can try, which work in different ways. Have you been prescribed cyclizine? This is usually prescribed first, but there are others. Cyclizine tablets did nothing for me. Stemitil was better; Avomine made me even worse!
Can you go back to your GP and ask to try a different drug?
Does your employer know that you are pregnant? Once they know, they need to do a risk assessment, and put in place interventions to you and keep you safe (I’d say this includes hydrated).
If you need to call I sick, then you need to know that pregnancy related sick leave must be recorded separately to normal sick leave and cannot be used against you. This is law. I had 8 weeks off for nausea and vomiting in both pregnancies- spent a lot of that time in hospital being hydrated on a drip.
sick leave during pregnancy
useful info about your employment rights when pregnant
Lots of extremely good medical, legal and practical support at Pregnancy Sickness Support.
Good luck going forward.