Your health care provider will first find out whether your nausea and vomiting are due to morning sickness or if there is another medical cause. If other causes are ruled out, certain medications can be given. Vitamin B6 may be suggested first. Doxylamine, a medication found in over-the-counter sleep aids, may be added if vitamin B6 alone does not relieve symptoms. Drugs that combat nausea and vomiting may be prescribed. If you are dehydrated from loss of fluids, you may need to receive fluids through an intravenous (IV) line.