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Headache, nausea and dizziness can also be due to pregnancy. Since your last menstrual period is not mentioned hence this possibility has been mentioned.
The symptoms can also be due to compression of the spinal nerves in the cervical spine region. This can happen due to overuse of computers, work involving straining of neck, canal stenosis, bone disease, spondylosis, poor posture etc.
GERD or gastric reflux and acidity too can cause this. Anemia, extreme fatigue and tiredness and high blood pressure are the other causes one must look at.
Since a confirmed diagnosis cannot be given on net please consult her doctor once. Hope this helps. Take care!
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