Your physician needs to review your blood pressure control
and rule out hypotension. Rule out dehydration,
anemia, hypotension postural, hypertension, hypoglycemia, cardiomyopathies, intracranial bleeding or tumor, migraines etc. Consult a physician for further evaluation if you have similar presentation again. Relevant blood tests for diabetes, electrolyte abnormalities, etc and cardiac evaluation including holter, echo, ecg, and MRI brain would be required to help in diagnosis. Take care.