I've had panic attacks, and they really almost feel like a heart attack. They are different though. My EKGs also came back normal.
Generally, if you have a pain that comes and goes or is gone in 20 minutes you should be OK. If you still don't feel OK though, don't be shy, call the paramedics!!!
When I was having the thyroid issues some years ago -- from a terribly overactive thyroid which gave me awful palpitations and chest pains which made me think I was going to die (I found out that my resting heart rate was at 109!), I left work and drove to our local Quick Care which was less than half a mile from my office. To this day I do not know how I got to the Quick Care or how I got home (1 mile away) that day!
They ran my EKG twice because the first one was a little funny, but the second one turned out ok. That's when this lovely young lady, Doctor Leeks, pre-diagnosed my thyroid issue and had the lab draw lots of blood!
When I still didn't feel well I had a very long talk with my Internist, who asked me a lot of questions and where my discomforts were.
The truth of the matter, Sillysyl, is that if you don't feel well go to your doctor and tell her! I did this maybe 2 time, I can't remember now, but then she suggested further testing because it was making me so uneasy (and my mom died at age 60 from hardening of the arteries of the heart).
Here's what I had done:
I went in for a dual isotope stress test (that's when they inject a very small amount of a radioactive isotope to monitor the movement of the heart about 1 minute before the end of the exercise portion of your test and then they have you rest until your heart rhythm steadies. They want to monitor the hear muscle to be sure it is beating properly before and after exercise);
I had an echo gram (where they do an ultra sound of the 4 heart valves to be sure they are beating properly);
And they administer a CAT scan of the heart (both before and after the stress test to monitor and compare the way the heart beats before and after), and everything turned out really well for me. It was a very small price to pay compared to the peace of mind it gave me!
Please see the doctor and let me know how it all works out!!