To dream that you are having a heart attack represents a fear or concern of never doing something ever again. A powerful fear of permanent loss or failure. Fearing losing everything you have or everything you've worked for. Feeling overwhelmed by fear, stress, pressure for something that is very important to you. You may feel a lack of support and acceptance.
To dream of dying from a heart attack may reflect you or someone else that has succumbed to fear, stress, or pressure. "Caving" or giving up because a situation was too much to handle.