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One of the most common cause of dizziness while upright is postural hypotension (b.p drop when standing from sitting position) and the most common reason is hypovolemia that is dehydration or decreased water content in the blood. And the second common cause is diabetes. I would recommend you to take lots of fluids and check your blood pressure and if it does not improve do followup with your doctor to make sure there is no residual infection and monitor your blood sugar level.
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