I had the same thing. My father died of a heart attack, and also had anxiety.i ended up with the same thing. Panic and anxiety certainly makes it worse. It like the fight and flight. When you get anxious you get the adrenaline going in to help in case a lion is chasing you. lol. The best you can do is believe the
Doctor, and reliese that you have no control over what’s going to happen. Live life each and every day, and stay calm.