Carotid Artery

Patient: Found I have a carotid Artery in the left side of my neck. The doctor told me to not worry about it. I Am now on a strict diet. Blood pressure, Heart, seems to be normal otherwise. Don’t have any pain or feel any different. Can I survive like this or is it terminal? It’s almost like being told, “Go home and die old man” Would really appreciate a answer. Thanks