9w pregnant with twins and can’t stop throwing up

First time parents and have been surprised by twins. All of it is still sinking in and we are slowly getting excited. But, my wife’s nausea has gotten quite bad recently. Last few days, constant throwing up, and today she couldn’t retain even a sip of water. Threw up over 10 times today and all she’s tried eating or drinking has come straight out again. We have been to the doctors and have been prescribed Xonvea. He said that it takes a few days to properly function, and to slowly take up to 4 10mg tablets a day. We were wondering if anyone in this sub has some experience with Xonvea? We’ve been reading loads of places that nausea and vomiting (and all other pregnancy related symptoms) are more intense with multiples. We aren’t sure if we are completely mentally ready yet. Any advice?

Edit: 4 days later, Xonvea seems to be working well. Started with 2 10mg tablets a day and now increased to 3. Still very nauseatic all day, but retaining food and water much better, hope the worst days are behind us.