How to decrease nausea and vomiting during pregnancy?
There are lots of treatments. First, the pregnant woman should change lifestyle modifications. Eating frequent small meals, avoiding foods that smell or taste adversely, avoid high-protein or fatty foods which can slow gastric emptying.
There are also over the counter treatments that may help. Vitamin B6 (pyridoxine), doxylamine (Unisom) and even P6 acupressure. See https://exploreim.ucla.edu/self-care/acupressure-point-p6/ for more information about this.
If all of these do not work, ask your physician for prescription medication.
Want more information? https://www.aafp.org/afp/2018/1101/p595.html
I hope this helps.