J.E.
I puked my guts out for my entire 2nd pregnancy, so I feel your pain!!
For my last pregnancy, there was a delay in getting my prenatal vitamin prescription from my midwife. She suggested that I take 3 Flintstones a day until we could get things squared away with my prescription.
I just spoke to my pediatrician about giving my toddler and preschooler vitamins because they can't handle the texture of meat, so they won't eat it. Our doc said that I should get regular chewable vitamins and NOT gummies to make sure my kids get plenty of iron because the gummies usually don't have enough in them.
I mention this because I had really low iron levels during all 3 of my pregnancies, so they put me on separate iron pills along with my prenatal vitamins. Ask your OB (or even your pediatrician) which alternative vitamin they recommend so that you make sure to get everything you need without the nasty side effects!
Good luck!!