Hi there. Im a little concerned with my health lately. Im a 19 yr old female that has just been diagnosed with hypothyroidism, and am on synthroid. I had a racing heart as a symptom and thought it would go away now that im on medication. I supposedly had an anxiety attack two weeks ago when i went to the emergency room with a heart rate around 190. I just went to my physician and she put me on xantax (I think that is how you spell it). It seems to help my heart rate but not for long. I also have visual snow, its not a very common disorder, but i have had it since i could remember. The VS recently got worse. My physician said that if i ever feel like my heart is racing to take the medication. If that doesnt help then she want me to see a cardiologist, she said nothing serious just maybe something wrong with the electrical part of the heart. The visual snow worsens at night and i seem to panic about it and i get most of my attacks at night. I have always been extremely healthy and in shape, so im not used to all this medical stuff. Just looking for advice to ease my mind. Thank you.