It does sound like it could be a heart attack
. Don't take a chance. Call 911 and get yourself to emergency. If it turns out to be just an anxiety
attack, you'll still be right in getting it checked out.
When my dad had his heart attack, he was convinced it wasn't one because the pain wasn't THAT bad (usually feels more like pressure). My mom is a nurse and knew right away it was one and got him to the hospital. Since you don't have a nurse handy, you must call 911 or at the very least call a friend or cab to take you to emergency if it is very close.