I am 16 years old, female, and sometimes my heart feels like it's beating uncontrollably fast. my dad has had high blood pressure in the past, yet my mother has had an overacting thyroid disease. I myself have had panic attacks and have had to see the doctor, because I thought I was having a heart attack. when my heart feels jumpy or like it's beating fast I'm not nervous, it might be me sitting down trying to fall asleep and it will happen. please try to help me!