Once I had tachycardia after surgery sounds like death metal band drummer playing on cymbals. Unforgettable)Don't buy a cheap, LOUD mechanical watch.
I bought an old Mickey Mouse watch, and my wife thought I was having a heart attack. Apparently, she listens to my valve clicking to confirm that I'm okay. If she hears tachycardia (or a fast, loud, ticking watch), she gets worried.