Can you still have a heart attack if your EKG shows normal?

I had an incident this weekend in which EMSA was called to the house for me. EMSA said they believe I had a mild heart attack. But when they hooked up the EKG to me it showed normal. I did have a blood pressure reading of 174 over 110, though and I was sweating severely. The pain in my chest felt like someone had shoved a red hot fireplace poker into it. I couldn't breathe, except for small gasps. I never lost consciousness, though. So, can you have a heart attack and have a normal EKG reading? Thank you.