I'm sorry you're feeling so awful. I went through the same thing and it is no fun at all!!!
I had it really, really bad from 6w to 8w, then started taking high dose b6 and b12 (in their fancy methylated forms). It didn't make the nausea go away entirely, but I finally was able to eat again and stopped losing weight (had been losing 3-4 lbs a week). Sea bands didn't help, ginger made me more sick, crackers made me more sick, ginger ale made my insides literally ache, Zofran just made me constipated..... Phenergan doesn't make the nausea better, but it makes me not care that it's there (but also makes me pass out) so I take it at night when the nausea is keeping me from sleeping or when my insomnia kicks in.