For my two pregnancy, I have suffered decent morning sickness during the first trimester.
Taking muti-vitamin was a challenge as well, but “multivitamin easymulti prenatal from PLATINUM” worked really well, probably thanks to the EPA and DHA, providing a coating role for the stomach.
If you are having a hard time intaking a multi-vitamin (provided you need to take one), you might want to give it a try. You should be able to find it at any health food stores. It is a bit pricy than the ones you can find at a drugstore, but I think it was worth buying for me.