Nausea help?!

Laura • Substitute teacher and full-time student! Mommy to my sweet little Ryan!
I'm 22 weeks and still throwing up almost every day. I've tried zofran and phenigran and dicelgis and they all help but none stop it. I've lost almost 30 lbs since I became pregnant. The baby is growing fine and is a good size, but I'm miserable and just want to eat! Any ideas?