You should see your primary care doctor
to discuss your concerns. In the meantime, a medication such as pepto-bismol or crystallized ginger may help with your nausea.
Constipation is a common cause of nausea, because of backup through your intestinal tract. However, there are other causes of nausea including endocrine disorders, infections, and dietary problems which your doctor will be able to screen for during your appointment. A complete physical exam will also assist with diagnosis. Gastrointestinal symptoms can often be a symptom of anxiety
or other psychiatric disease, so you should discuss your mood and lifestyle with your physician as well. Finally, pregnancy is a common reason for nausea in young women, so you should tell your physician about any sexual activity and the date of your last menstrual period.