I unfortuanatly had to resort to Zofran, which I'm still on even though I'm 29 weeks now. The upside of that was that I think I've had every remedy under the sun seggested to me, and while they didn't work for me, maybe they will for you.
There's the old stand by of saltines and ginger ale. Also dry toast. Keeping a steady stream of bland, dry food in your body most of the time seems to help some people.
I've also heard that taking vit B12 at night with a unisom (make sure it's doxylamine) can help ward it off for some women.
Preggo Pops, and Preggo Pop drops are sold at baby and maternity stores, and they work well for some people too.
My MIL suggested making tea out of ginger root steeped in hot water, with a lemon wedge and some honey.
If I think of anything else I'll post it, but like I said none of the above worked for me. I was way past the point of nausea though, I was in the hospital for hyperemesis. Hope some of those might help you!