Emergency Room visit. Me metosartan.

Yesterday I had a left chest discomfort and pain in left shoulder blades along with rapid heartbeat of 130-140 HR and BP of 170/100. I went for ECG near by it says Sinus Tachycardia and Left posterior block. Then I had to rush to ER. They took 2 ECG more one after giving metosartan to me and put into observation and discharged me late night. Previously I have been suffering from on and off chest pain and rapid heart beats. But I have had Stress Echocardiogram and CT CA which came absolutely normal before the episode that happened yesterday. I'm a 32 year old guy and I take metropolol 25 and Telisartan daily. So what happened yesterday. I am attaching my abnormal ECG report and ECG that was taken after giving me metosartan.