I've never had an arrhythmia, but I used to get very dizzy—maybe lightheaded is the better way to put it—under various conditions, none of them easily explained, and yes, a couple of times I did have to walk around for 24 hours at a time with a monitor. They eventually localized the problem as seriously low blood pressure, which has always been something I've had; but the point is, as soon as I mentioned the problem to my MD, she was on top of it in every direction. Anything, anything at all, out of the ordinary in terms of fatigue, balance, heartbeat, whatever, and any competent physician will mandate every test in the book till the cause is identified.
Here's the thing, which may be a problem that the OPer, like many other people, has: most of us are trained to listen to what our doctor says, meekly accept it, and feel embarrassed to push aggressively for followup investigation or in-depth testing. We don't feel it's polite, or respectful, or something. But again, think of your doctor as a car mechanic for the human automobile: you wouldn't accept it if your mechanic told you that that persistent crashing sound coming from the engine was just one of those things, eh? and there's nothing to be done about it. Assume you're fortunate enough to be driving a late-model Lambourghini. Would you take a chance on something happening to it mechanically? Well, your body is worth an infinite amount more than that Lambo—why wouldn't you be at least as persistent in looking after it as you would with an ultra-fancy—but still, ultimately replaceable—car?
Here's the thing, which may be a problem that the OPer, like many other people, has: most of us are trained to listen to what our doctor says, meekly accept it, and feel embarrassed to push aggressively for followup investigation or in-depth testing. We don't feel it's polite, or respectful, or something. But again, think of your doctor as a car mechanic for the human automobile: you wouldn't accept it if your mechanic told you that that persistent crashing sound coming from the engine was just one of those things, eh? and there's nothing to be done about it. Assume you're fortunate enough to be driving a late-model Lambourghini. Would you take a chance on something happening to it mechanically? Well, your body is worth an infinite amount more than that Lambo—why wouldn't you be at least as persistent in looking after it as you would with an ultra-fancy—but still, ultimately replaceable—car?