frequency of unstable angina symptoms
Unstable angina. Unstable angina symptoms are similar to a heart attack. Call 911 or other emergency services immediately if you think you are having a heart attack or unstable angina. People who have unstable angina often describe their symptoms as: 1  Starting within the past 2 months and becoming more severe.nstable angina symptoms are similar to a heart attack. Call 911 or other emergency services immediately if you think you are having a heart attack or unstable angina. People who have unstable angina often describe their symptoms as: 1  Starting within the past 2 months and becoming more severe.