Extreme nausea

What pills or home remedies do y'all have for nausea? My sister and I are currently pregnant and nothing is working for her and she's living on water! We've tried ginger ale, crackers, mint, upping her water intake. But everything makes it worse so if y'all have anything that worked for you that'd be helpful. Her OB just told her to wait it out so he's no help. But I hate seeing my sister like this so help us!!!