About 15 hrs ago I experienced severe tightness and pain in my chest. I kept pushing on my chest with my fist. Should I go to the E.R. and get checked out? If they were to do an EKG would it show if I had severe angina problems yesterday. The pain lasted about 20 minutes. I was scared and asked the sales clerk to get me a seat becasue I felt so weak. I was just having a shopping day at the mall while my daughter was trying on clothes. Please advise me on what to do.