Sucking on fresh ginger is a great way to treat vomiting. When I was pregnant, I had nausea all the time and I vomited everyday, several times a day. It wasn't just morning sickness for me. Crackers definitely helped, but something else that helped was ginger candies or fresh ginger. I'd take a small slice into my mouth and just suck on it. It is a little spicy but it settles down nausea and it's great for the tummy as well.