I have been struggling with Cardiophobia for many years

Cardiophobia has been single handedly controlling my life. I am so terrified of my own heart beat/fear of a heart attack/fear of heart disease/and disgust of feeling my own heart beat and just knowing it’s in my chest beating non stop. I’ve been through periods where I exercise to try to prevent heart disease and I’ve been through periods where I avoid any kind of physical activity where I can feel my heart beat. I can’t even sit still because when I’m relaxing I can feel it. I just don’t even know how to wire my brain into not thinking this way.