I am a 18 year old female and last night I started feeling my heart in my throat and noticed I could feel it more than usual. My grandma who is a registered nurse counted my beats per minute and it seemed a little off. Then it didn't go away so I had my mom who is a nurse practitioner listen to my heart beat and take my heart rate and she said it seemed normal. I had Diet Coke with dinner and it went away after I talked to my mom then I had some smores and it started up again. I went to bed and when I woke up its been happening again. all I have eaten today is a banana and water. My family has had a history of thyroid problems and I can't get in to see my primary. Anybody know what is going on with me?