Palpitations fro Copper IUD

I was on copper IUD since June 2020. Started experiencing heart palpitations a year after. Been to my doctor for check-up. Did ECG, electrolyte imbalance, Bp fine. Results of ECG indicates im experiencing anxiety. I dont have anything bothering my mind so i dont know where the anxiety could come from. I removed it myself lastweek, meaning i had it on for about one and a half years. Still experiencing the palpitations. Its really really😔 disturbing. What can i do to get this mess fixed as fast as possible? Hiw soon will it end if left untreated?