I have had issues with episodes of heart arrhythmia (palpitations) all of my adult life, before, during, and after my drinking years. They were much worse during periods of withdrawal, and for a while after I finally quit drinking for good. I remember I had an especially bad bout at around a year sober. I had them checked out several times over the years, and each time was assured that they were benign. That didn't help me much when it felt like my heart was going to bang right out of my chest, or stop beating entirely! I still have the episodes, but they have calmed down considerably over the years since I got sober.
You might ask your doctor about a beta-blocker such as Inderal (propranolol). It helped reduce the severity of my arrhythmic episodes.