Had a hypertensive crisis and wasn't feeling well for 3 mths. Anyhow my new Dr thought my pulse rate was too low and did an ECG . Turns out I had a 100% heart block requiring a pacemaker. Inserted within 24 hrs . Ok now but emotionally drained a little by it all. I'm not quite as resilient as I thought I was.
Lucky you swapped when you did. FWIW, feeling emotionally drained is common for patients after heart surgery. Best of luck with your recovery.