Hi Sue1979!

Firstly, my heart goes out to you , I dont know the right answer re: protein drinks but I want to assure you not to panic about the situation. I have had hyperemisis gravidarum in my pregnancy and for the first 16 weeks I honestly kept nothing down but green apples, no protein, no carbs, very little fluid and no folate . I was absolutely terrified that my baby would not be okay but at each scan it was kicking away and thriving on everything it was taking from me. Cheeky little devil has taken everything I had! I was throwing up 24 hours a day.
From about 18 weeks I could eat toast and plain pasta occassionally. But since then have pretty much lived on fruit and a few 'extras' up unitl about 2 weeks ago. There are so many things I still cant eat.....
As for the hot chips, I read that they actually calm the stomach- sounds absurd I know but apparently potato chips (packet) can keep the nausea at bay as well, until they come back up.
If you find a protein shake is safe and you can stomach them then go for your life! Find what settles the stomach and go with it.
Hope it all eases soon xxxx