Hello girls, I wanted to ask anyone who had experienced something similar…

Hello girls, I wanted to ask anyone who had experienced something similar at such a time or even just in general, what happens when you lie down and your heart beats really hard, when lying down your pulse is 80, and then you feel nauseous because of it and discomfort in the area of the heart? I already wrote to my doctor, told her to drink valerian tincture and if tomorrow doesn't get better, go see a cardiologist.