Hi, you might want to ask your GP or OB about an over-the-counter med called Restavit. The ingredient is doxylamine and it is proven to be really effective with nausea. It is Cat A for pregnancy so very safe. I just don't know why more GPs don't know about it. It's crazy. It's on the Royal Women's Hospital protocol for treatment of Nausea and Vomiting in Pregnancy. A drug called Diclegis is available for morning sickness in the USA and it is a mix of doxylamine and B6. It's not available in Australia but you can recreate it by having Restavit with B6. Usual dose is 1/2 tablet in morning, 1/2 tablet in afternoon and full tablet in evening. It's actually marketed as a sleeping aid so it will make you really sleepy for the first two weeks and then your body will adjust and you won't be so wiped. If you don't have little ones to look after, then I say, just sleep and enjoy not being sick!
You can actually buy Restavit over the counter without a prescription but if the pharmacist knows you're pregnant, they might say no. That's just because they are not up to date with its use. You could get a friend to go in and just say it is for sleeping, because it is technically a sleep aid. But, you might feel better talking to your doc about it anyway.
I just wanted to share because I'm so frustrated that this safe, effective medication is not routinely offered to women in Australia. They go straight for maxolan (mostly useless) and zofran (only effective in reducing vomiting but does very little for nausea). Good luck. Hope you feel better soon. Don't forget to go in for fluids if you feel dehydrated.