I have been suffering for last 5-6 days from rapid heart beats of 140-150 that starts daily in the morning around 9 am that also causes chest pain, dizziness and shortness of breath. Yesterday I went to ER and ECG come normal. I have been told that I didn't have heart attack. Previously I had Echo a month back which was normal and a coronary angiography around 4-5 months back which come normal as well. I take medicine metoprolol 50 mg and olmisartan 20 mg. As my heartbeat episodes have increased for last 5-6 days. Doctor have now put me on Ciplar La 20 BD. But he still says that heart is doing fine and it's only sinus tachycardia. I feel very worried am I at risk of cardiac arrest? I am checking my oxygen level as I feel breathless and dizzy but SpO2 levels are coming 97-98 every time. I am also have stomach upset and GERD issues ? Can these symptoms be due to my stomach issues? I'm attaching my yesterday's ER ECG.