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Change in position and vomiting and feeling of getting thrown off points to dysfunction in Vestibular system
. It could be due to infection, degeneration or other causes as well. Better to get your blood pressure and blood sugar tested as well to rule out Hypertension
and Diabetes respectively. Avoid sudden changes in head position, you can take anti-vertigo medication like Stemetil under medical supervision for relief from vertigo. Consult an ENT Specialist
and/or a Neurologist
for proper assessment of your condition and treatment.