I have chest pain for years, but its started to get stronger by the day. its like someone holding me downhow would i know if i'm having a heart attack?

Go to ER: If you're having chest pain of increasing severity, especially if accompanied by profuse sweating, pain radiating into left arm, difficulty breathing, go to er asap; do not drive yourself or have a friend/relative drive you. Call ambulance for transport.

See someone today: If you have suffered from chest pain for years an it is now worsening, you have unstable angina. This could be a sign of an impending myocardial infarction (heart attack), get seen today by a physician. Now. Don't keep reading, get up, get on the phone, get in to your emergency room. Really.