I know from personal experience. Discovered the hard way at 39 that I had it. Fortunately, I only went into tachycardia instead of the almost always fatal fibrillation. Now I get to walk around with a pacemaker/defibrillator implanted in my chest, but thankful to be alive and living a normal life.
I have tachycardia. I won’t take the drugs they’ve tried to give me. The last time they gave me trenorman(sp?) made me feel terrible. I started taking extra magnesium and that seemed to help a lot. Mine is probably genetic, my mother and aunt have the same problem. If my heart really gets going wacky, I just sit, relax, take a slow deep breath and blow out slowly. Most of the time that does the trick, sometimes I have to do that two or three times.