That sounds like a Godsend. Workload at this end is causing immense stress, and some of the same symptoms you and LJ have referenced. If the breath-holding puts a stop to it, I personally will be one happy (but still cantankerous) old-ish goat.
Mine alwaays started with the heart speeding up, tunnel vision, arrythmia, and then blackout. I wore a Holter monitor for 24 hours and it recorded my heart rate going up to as high as 177bpm 52 times. They put me on medical leave for a couple of months to reduce the stress and fatigue and I wasn’t allowed to drive. I had stress from many directions. I was working around 84 hours a week on rotating shifts, was in management, and my husband couldn’t remember where I was. He called me about every two hours asking where I was and when I would be home. I gave up and retired at 58. LOL
The breath holding compresses the heart to slow it down and naturally relaxes you.
The cardio exercises kept the stress related adrenaline burned off.
If I feel a spell coming on and start the breathing, breath holding exercise, it never goes to the tunnel vision/arrhythmia stage.
The doctors said there was nothing wrong with my heart but stress can cause a heart attack in a healthy heart and/or a stroke.
I will ping you to the Natural Health thread when I post some more about heart. And maybe to some herbs that I sue.