Hi there. I was a competitive runner, snowshoer, and did a lot of hard cycling. I was in the Canadian Armed Forces for 30 years, always fit, well-looked after for dental hygiene and general health, always vaccinated before deployments oversees. I developed atrial fibrillation (AF) suddenly near the end of a 10 km maintenance run. Long story short, I had all the usual tests, none turned up anything. The last diagnostic left in the list was an overnight sleep lab ( a polysomnography with a gazillion leads and machines blinking at me all night. Fortunately, I slept well for about six hours). Or....so I thought. The result that was fed to me ten days later was that I have severe sleep apnea. Who knew?!

Is your arrhythmia determined yet? Chances are that it is either PVCs (premature ventricular contractions(, PACs (premature atrial contractions), or AF. It might also be SVT, or supra-ventricular tachycardia, but the tachyarrhythmias are still in sinus rhythm...they're just quite a bit faster than necessary, often well above 130 BPM even at rest. A Holter monitor worn for several days, or a loop recorder, or maybe even an ECG while your heart is acting up one day, will determine which of those it is.

Welcome! I've been learning a lot from this group. I am turning 81 in January and have lived a similar active life. I let my three mile a day habit lapse when I moved to a desert house in southern Utah. I thought the five or six mile hikes were a good replacement. Then I stopped the hikes -- too hot, too early, etc. I thought my weekly pilates, yoga, and aerial yoga was enough. I developed all your same health concerns. I had a bunch of tests on a bunch of machines. Then meds prescribed and taken. I was still lethargic and fuzzy headed. I am now feeling better because we acquired an Aussiedoodle puppy -- a wild woman dog who requires a two to three mile walk on the desert every morning. I think I have found my cure...back to that daily workout to start the day. That probably isn't your answer, but thought you should know you aren't alone in the frustration of living actively, eating healthily and not getting rewarded as well as you should be. But, then again, I look at other 80 year olds and count my blessings.

I understand. I am 76. I started having irregular heartbeat and traced to caffeine. I quit the caffeine, but lately having heartbeat issues lasting a couple of minutes, but today had one lasting longer. Am discouraged. Always considered myself a health nut. Eat better than anyone I know but not perfect. I believe it is after effects of covid I had. Not looking for advice. I do not run to the doctor for anything. Just venting my frustration.