The past few months I have been experiencing what seems to be an odd group of symptoms. I went to the doctor because I felt intense pressure in my ears. While there the doctor told me my heart rate was too high and that she heard a new murmur that I have never had before. I knew that my pulse had been higher because I could feel it, but I thought I was just sick, I really didn't think much about it because I am in general good health and only 26. However, I have been having other symptoms, the most prominent being a feeling of breathlessness primarily when I am talking, but occurs at other times as well. The racing/pounding heart rate tends to always occur when I lay down. I have had blood work which is all normal, my EKG showed tachycardia, and my ECHO was normal. I am not sure where to go with this. My doctor is telling me that right now all they know is my heart is at times beating abnormally and she hears a new murmur. The thing that bothers me the most is the breathlessness. I am a 26 year old, 135 lbs. healthy female with no significant medical history. Any suggestions what this could be or what I should do next would be great. Thank you for your time!