Was your blood sugar tested in the ER? Hypoglycemia
is more common cause of your symptoms. In addition, did you get your blood pressure checked? Hypotension
is another cause for feeling light headed and dizzy.
If all these are normal, then a re-evaluation of the drugs you are on, need to be done. A probable increase or decrease in the dosages may help you.
Meanwhile, please get a plain MRI
of the brain done to rule out any intracranial cause.
Please follow a strict diet, exercise regimen to stay in good health.
Hope this helps.