Iv had ecg holter monitor i suffer aniexty and panic attacks chances of sudden cardiac arrest due to palpatations?

SCA: Very little chance of sudden cardiac death. Get help for your anxiety and panic disorder

Low hanging fruit: its always easy to blame signs and symptoms on anxiety. if a holter is the only work up thus far ,an echo to assess your heart function and structure,labs,and a 30 day event recorder to assess intermittent symptoms would be appropriate. electrolytes,calcium,magnesium,thyroid function,hormone levels etc as indicated. stop all caffeine or natural supplements.If all neg, THEN anxiolytics and psych rx

Ecg: If palpitations are not due to an arrhythmia you should not worry, but I recommend having that documented with some tests like ECG Holter event recorder