A heart attack in a dream is read as emotional overload — heartbreak, stress or a love life under strain. Having one yourself is usually taken as a sign that your feelings have been carrying too much for too long. Someone else collapsing points to worry about them, or to fear of a relationship suddenly breaking. Surviving it is read as coming through an emotional crisis. Dream books treat it as a symbol of the heart’s feelings, not of its health.
Does the traditional reading fit your dream, or did it mean something else to you?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.