Help!

5 weeks and I already have awful morning sickness, except it's at night when I'm ready for bed. I ate a few slices of pizza and had plenty of water. When it was time for bed, of course, my tummy was growling but I was nauseous. So I grabbed a small sugar cookie (I usually LOVE them) and now I feel like I could throw up food from last week, lol. What have you mamas used to help with the nausea?