Hello, I'm a 21 year old male, and I've recently had several tests done on my heart cause I felt like something was wrong with it a couple months ago. I've had an echo, ekg, holter monitor for 24 hours, 5 physical exams, and a chest x-ray. All of them came back negative. The only thing was sinus arrhythmia which the doctor says is normal, and palpitations on the monitor, but nothing serious. I still believe something is wrong with my heart, cause last time I was at the doctor, he said he felt some irregular beats, but nothing serious. I was very nervous in his office, so I wonder if that attributed to it. I was wondering if these tests are enough to show if somethign was seriously wrong with my heart, or should I have more done? I suffer from anxiety and panic attacks recently cause I always feel something is wrong with my heart and when it speeds up, I get really anxioius, please help and respond...are these tests enough?