Prenatal vitamins

For the past 5 weeks I have been taking my prenatals right before I went to bed, I have also been extremely nauseous the next day, all day. I didn't take them last night and I woke up this morning feeling like a brand new person. I feel like I can eat a full meal and actually keep it down.I know it's very important to take the vitamins but waking up miserable is just getting old. What can I do to help with nausea and still take the pills. I'm REALLY enjoying not being over top of a toilet all day today.