Be your on advocate! You are living example of this attitude. I applaud you for your persistence. The saga you describe is common scenario.
I was DX with PVC (Premature Ventricle Contraction) in 2023. When I had pre-op testing before carpal tunnel release surgery, my EKG result showed the PVC's. Red flag went up! I did not have any symptoms. I was fast tracked for holter monitor, stress test and echo cardiogram.
All in one week so I did not have to delay/reschedule surgery.
The PVC's would be a concern of Anesthesiologist. Not give clearance for surgery. After the testing determined my case was "mild" and could be treated with RX, I was put on Beta blocker.
Surgery went well with no complications. Cardio follow-ups were quick visits. My last one was in June of 2024. Doc said to return in a year!
I believe my heart rhythm abnormality is directly related to stress. When situations challenge my coping skills, heart will respond negatively. Seems logical: heart is a muscle. Under stress, muscles become tense.

I'm not fond of taking meds bc of the dreaded side-effects. I asked the Cardiologist to change my dose from 100mg to 50mg. He did not advise that. The pill is scored so I can halve it when I feel the need for lower dose.
We sometimes are cogs in the wheel of Big Pharma and clients of the Medical Caretakers who operate under the burden of government regulations.
Your earnest pursuit of a doctor who listens is admirable.