Weird arrhythmia, please help

I was laying in bed everything completelt fine maybe felt a little off for a few mins before, but out of nowhere my heart feels like it stops beating altogether and is replaced by just a fluttery butterfly type feeling instead of a beat, i got a bit lightheaded and then it stopped as fast as it started. Lasted maybe 3-4 seconds. What could this be? Cards dont like seeing me because they say im completely healthy and im just anxious. They’ve captured my PVCs and Couplets and runs of supraventricular ectopics. Im so tired of feeling like somethings wrong with me but they either just dont care or dont wanna diagnose me or dig deeper. My heart is structurally normal. So i’m really just completely safe from these rhythms? Can someone help me understand. This is exhausting.