I've quit multiple times. Generally I need a small amount to avoid the headaches as I taper off. And then I sleep a lot. But afterwards I'm normal and my energy levels are more steady.

I'm drinking coffee regularly now for health reasons. I don't use robusta which has too much caffeine, and I don't drink energy drinks.

Ectopic heart beats or even afib can be exacerbated by caffeine, but not by as much as I used to think. Caffeine is often blamed by rarely causal. Usually there is some other underlying etology. Check your electrolytes. Avoid alcohol. A hiatal hernia, sliding hernia, GERD or even just gas trapped in the upper stomach can press on or tug on the heart and cause funny heart beats. That's my experience at least.