i began having worsening episodes of arrhythmias about 6 mos ago.
mine usually lasted no longer than 45". i had a lot of the same tests. i tried wearing a couple of different monitors but could never catch it at the right time.

finally my dr ordered a monitor that i wore for a month. that did the trick. i was dx'd with A Fib or atrial fibrillation. untreated it can increase the risk for cardiac blood clots because the heart is quivering and blood tends to pool which can make a clot. i ended up on an anti arrhythmic. i also had to start on a blood thinner. i didn't want to but i understood the risks.

make sure your dr really documents what kind of arrhythmia you have. not treating unless you're "passing out" doesn't seem right to me. the fact that you're symptomatic should count for something.

advocate for getting more information, and, get copies of your test results and dr dictations. you might learn a lot.