The calcification she mentioned on your chest xray is probably a granuloma
, which is caused by a fungus called histoplasmosis
, and if you've been healthy otherwise it has no clinical significance for you. If your EKG was abnormal the doctor would have called you by now. I'm not sure exactly why you are having these symptoms, and it does need to be evaluated further, but you are at very, very low risk of having a cardiac reason for your symptoms. But you did need to see the evaluation through to its completetion. I have evaluated many folks your age with similiar symptoms and have yet found any significant heart or lung abnormality. Many times the cause is not exactly identified. I hope you are feeling better soon. And in the mean time take comfort in the fact that your are young and all your test have come back normal thus far. Try not to be to anxious. I'm sure you'll be fine.