I used to do the same exact thing as you at the age of 21 also. I also didn't believe the doctor so would go see another doctor to run the same exact test. etc. everything was fine but I needed to feel it and I didn't believe it. The same thing would happen to me also no sleep and I felt worst then all day I would focus on what if this and what if that. get 2 bags of chamomile tea. drink it, relax and go to bed. surround yourself by positive people and don't listen to the news. That stuff indirectly triggers us. I could tell you so many stories of how I would have doctors do so many random test.
I have the same issue. I have major cardiophobia and flutters/ectopics which are benign, but they're scary. I have bad days where I get about 50-100 of them and they're pretty strong. Most of my anxiety revolves around this worry despite the fact that I've been told they're harmless. It's a hard fear to overcome but it can be done. Therapy is a great option if you have the resources for it, because it's your anxiety that's the problem, not your heart.
It's the flutters that scare me and bring me rigger back where I started
You know, I've written on I don't know how many of your posts at this point. the problem, kingchris, is not our heart, it's your anxiety. You are not accepting this. But it IS the answer. Nothing will change until you begin therapy and treatment for your anxiety disorder. good luck