I'm thankful we're living in an age of experience on such matters, both diagnostic and intervention. By Monday, I trust you mean tomorrow?
Keep up your spirits, I'm serious about trusting the skills and technology. I can't speak to your circumstances, but you may benefit from mine.
I've had several echo and nuclear tests over the years. One, several years ago, had me sitting there, and I was generating a ton of PVCs (irregular heart beats) while I was waiting to do the treadmill part. An athletic man was running away on the treadmill, seemingly for hours, and he got 1 PVC and was worried. I probably had more than 50 while waiting to get on the treadmill, I wasn't sympathetic with his 1 (and his doctor to him he was OK as well). My test done (my PVCs go away under exertion), I was put into a waiting room (I think I was having a nuclear stress) to wait for my heart to slow and calm. During this time, they put a young woman on the treadmill, and I could hear the beeps of the monitor. Suddenly it broke into a very fast rhythm, the beeps were going wild, and they immediately took her off the treadmill, calmed her down, and transferred her to the hospital.
I'm not sure where your test was done, or the circumstances of the test, but some people have results so bad that they are not allowed to leave. Abnormal may mean various things, I'd be assertive about getting answers, and about treatment and prophylactic options.
Please let us know how things go. Wish you the best.