Hi there ~
You mention that your EKG was not normal but do not mention what the abnormality in your EKG was and whether or not you discussed this with your doctor. I would advice you to do so if you have not. I also think that you will benefit from consulting a doctor anyhow for the lightheadedness
, as it would reassure you even it has been a psychological issue. If there are other psychosocial issues that need to be dealt with, you might need to consult a psychiatrist
I hope this helps. Take care and have a lovely day!