It's better to stay away from the meds but your doctor or midwife should be able to help you determine what you need. Assuming you are like most women, which is to say you'll just have to suffer through, here is a list of non-med things that helped me. I was horribly nauseous for about 18 hrs a day (and vomited every 3rd or 4th day with bizarre regularity) for about 4 months. I thought it would never end but it does, eventually.
1. lemon juice - add to your water and try to make lemon water the first thing you drink in the morning when you wake up; or lemonade works well too.
2. protein snacks - skip the crackers and try protein instead such as a handful of nuts or a waffle or half bagel with peanut butter.
3. eat lots of very regular, healthy, "mini" meals during the day - helps regulate your blood sugar and means there's less in your stomach to throw up if you do - for example, I ate something every 2-3 hours w/ my first meal before I sat up in bed and my last as I was lying down to sleep. Have to make these fairly small, however, or you'll gain weight fast. :-)
4. keep some kind of food (for e.g., cereal) next to your bed that you can eat a handful of before you sit up in bed in the morning.
5. cucumbers - one of my mini meals was a bowl of sliced cucumbers, I ate mine w/ a little balsamic vinegar and some salt & pepper.
6. salt - try the warm popcorn they sell at Target; it's even good the next day if you put it in a zip lock bag overnight
7. wrist bands - they make wrist bands that put pressure on your pulse points; most maternity stores sell them; these are the same ones used for motion sickness.
8. accupuncture - provides great relief and doesn't hurt; feel free to email me if you have questions about it and/or would like a referral - I know of a couple of good accupuncturists in Dallas.
9. stay away from foods that smell funny or strong - strong smells, even if they're good smells tend to induce the vomit.
10. keep food and water with you at all times - you never know when you'll get delayed or distracted and if you can stick to your mini meal schedule regardless of where you are, it will be easier to fend off the vomiting.
Hope this helps. L.