Panic Attack Question???

I have panic attacks regularly but I've been reading that they can be mistaken for Heart Disease. I am overweight but I'm only 20 years old and I had at least 2 or 3 EKG's done in the last year and they said that everything was fine. By the way, I just became overweight within the last 2-3 years so it's not like I've been severly overweight my whole life or anything. My blood pressure is a little high but that's all thats ever been wrong with me. Should I be worried?