Heart Issue. Influence on the symptoms?

Hi Doctors, I have healthy anxiety for the last 6 months. I feel like I'm going to have cardiac arrest anytime soon. I consulted so many doctors, my health checkup, ECG and Echo test all came normal. My diet is also healthy. Whenever I hear that someone died due to cardiac arrest, I feel like this can happen to me too. I feel heaviness in my head and irritated all the time. My periods are always late and I also suffer from heart palpitations which makes me worry more. Everyday, when I lie down to sleep, even a bit of sensation in my chest or palpitations gives me the feeling that it is going to happen now. I sometimes feel a tingling sensation in my left chest. Is this a sign of a heart attack? Should I be worried. Also, I work in night shifts, can this have any influence on the symptoms?