I had a monitor also, twice several years apart. Nothing was wrong "structurally" which is what they look for first. So I needed no farther testing. But not one of the doctors explained that it was "stress" related which I'm thinking was not right. But, the heart palps have stopped. i also think it was from my family doc increasing my Effexor up and up and up and one of the side effects of that drug are heart palps! I'm not on it anymore thank God.
Hopefully your monitor testing will be fine, and if it does show something abnormal, they will be able to figure it out and fix it. I know how the waiting is the hardest part and I'm the type who needs to know what could be wrong and start looking up all sorts of info on the internet. Even though that is probleably not the best thing to do, that's me. I want to know in case I have questions for the doctor.
Good luck and try to relax with the monitor. easier said than done, I know. We are all pulling for you!