I am sure you are concerned about your illness. Having such symptoms especially with five stents inside will panic anybody and they were right in getting you examined all over again, just for the sake of safety. As far as your question is concerned, YES, anxiety
can cause these symptoms and is actually much more common among heart patients as is ever thought. You should start taking sertraline
for your symptoms and also cognitive behavioural therapy will also help you.
Hope I am able to solve your concerns.
Have a nice day!