It worked (or should I say helped) when I was pregnant with DD2. I too didn't vomit, just had 24/7 nausea until about 15 weeks. I'd highly recommend it and snack often if you can. I always had snacks on my bedside table and would nibble whenever I woke at night, even if I was just going to the loo quickly.

Hang in there, it feels like forever at the time but it quickly becomes a distant memory.