@jfching, I'm relieved that tests were done and that cardiologists were able to confirm that your heart is strong. This rules out your concern of heart failure. You've also wisely identified that your anxiety has the upper hand and you fear your anxiety will be your undoing.

That's the first step to gaining control - asking for help. You might be interested in this helpful, related discussion:
- Journaling - The Write Stuff For You?
https://connect.mayoclinic.org/discussion/journaling-the-write-stuff-for-you/
Do you journal? What hobbies or activities distract you from the anxiety? How do you manage your anxiety?