Not all chest discomfort is simply angina. Here are some symptoms that may signify that your angina attack is serious and that you may actually be having a heart attack. If you have any of these angina symptoms, call 911 immediately:
Pain or discomfort that is very bad, gets worse, and lasts longer than 20 minutes
Pain or discomfort along with weakness, feeling sick to your stomach, sweating, or fainting
Pain or discomfort that does not go away when you take angina medicine
Pain or discomfort that is worse than you have ever had before.