I have gone through and device closure in 2008 (at 25 years of age, I have hypothyroid since 2014, since last 4 years (at the time of my pregnancy) I started feeling tightness in chest, palpitations, dizziness and skipped/extra heartbeats I suffered from sudden tachycardia (heart rate was around 250) on 16th Dec 2017. All reports are ok as per doctor he prescribed me metxl 25 once daily. I am taking that medicine since then. I still feel irregular heartbeats almost daily. Suggest what should I do?