I had trouble with prenatal vitamins making me sick too. When I told my doctor that, he gave me a prescription for different prenatal vitamins that had a vanilla coating, so they didn't have the vitamin smell, and they were a lot easier to take. That might be something you could ask about.

I also never felt like eating when I was pregnant, and would lose weight at first because I just didn't want to eat, and nothing sounded good. Cheese and crackers turned out to be a snack I could handle. If you can find a snack that you like that has some nutritional value, you could keep it on-hand and try to remember to try it when you need to eat and nothing sounds good.

(No, I'm not pregnant now - last time was 7 years ago - wow!)