Hi. I am 41 years old. I am having chest pains from last 2 years. I have seen many doctors. They say it's anxiety and hyper acidity. My bp sugar thyroid all r normal. But have vitamin d and b12 deficiency for which I am taking supplements. From last 2 days I am feeling pain in my chest neck and left arm as soon as I lie down. I am fine when I am doing any work. I go for walk everyday and Walk around 3 km without any problem. I am very scared of heart problem. What could need the reason of pain while lying down. Please help.