Chest Pains and rapid Heartbeat.

I have had chest pains and heartbeats on and off every alternate day these days after extertion giving every feeling of Angina. Due to this I have been to ER multiple only to be told that I have sinus tachycardia in ECG and no Elevated cardiac enzymes.I had coronary angiography 5 months back which was normal I was only told that I have mid myocardial bridge in LAD which is not serious. Before that I have Stress Echo in 2021 and TMT in September 2022 which were negative for CAD. Multiple Echos and Recent in holter I have been again told sinus tachycardia even though my heart beat shoots to 165 in that. I am very anxious and fed up these chest pains, heartbeats and dizziness. Am I candidate of SCA ? Or these symptoms are not heart related? I was told since my TMT is negative so I won't be relived from Deroofing surgery.