Hello and welcome to HealingWell. If your Drs. feel your heart is OK and anxiety is your problem perhaps you would like to join our Anxiety & Panic Forum : https://www.healingwell.com/community/default.aspx?f=9
You will meet many members that have the same types of issues you have posted. Health Anxiety is extremely tough to live with so I am going to post some links for you to take a look at.
Books for overcoming Health Anxiety:
I am here for you and you will find me in the A & P Forum also. Looking forward to getting to know you better.