Why is my heart beating so fast? I'm suddenly shaking now. I don't know how this happened, all I know that I was playing a game then my heart started beating fast.

Heart Palpitations: Symptoms, Causes & Treatment

What is wrong with you if you're just sitting and doing nothing but all of a sudden your heart beats very fast? - Quora

Should I be worried if my heart beats fast whenever I lay down? - Quora

Racing Heart? 12 Reasons Your Heart Rate Won't Go Down

Why Is My Heart Beating So Fast?

Why is my heart beating so fast? I'm suddenly shaking now. I don't know how this happened, all I know that I was playing a game then my heart started beating fast.

Why is my heart beating in my stomach? - Quora

Why do I get nervous more often and my heart starts to beat faster for no apparent reason at all? - Quora

Tachycardia - Symptoms and causes - Mayo Clinic