I also have had abnormal heartbeats for years and never thought anything about it. But when I went in for my gallbladder, they acted like it was a HUGE deal. They ran a ton of tests and heard a heart murmur, they found I had mitral valve prolapse. So they put me on a beta blocker, Lopressor, 50 mgs. 2x aday and it helped a lot. I'm very laid back now. Anyway, it's better than everyone freaking out over me! I would go along with whatever tests your doctor orders and prove that you're fine. Good luck to you--hang tough, my friend!
Hugs,
Soibhan