I've had them before, ginger, in my last pregnancy. I got them from about 10 weeks as I was very sick. Sadly by the time I started the sickness had set in so much that it was really a bit late, but they did take the edge off.
I developed full blown HG, because I carried on teaching when I should've been off sick.
I am calling the doctor tomorrow to get some this time. I haven't actually been sick this time, but that's because I have done as little as possible - sleeping, resting on sofa as MUCH as possible. Hoping to stop it before it starts, as I feel very sick already.
Be very firm that you need them - they will start you off on cyclizine, and if that doesn't work you need to go back and ask for ondansetron. They're a bit more reluctant to prescribe it, but it's worth it.
Also, have you been on the Hyperemesis Support thread? It's very supportive and everyone on it is going through the same, so it might be worth a look.
All the best!