Yes I am sure ones heart can give up due to stress and anxiety in the body.. The body excretes hormones to help it get into flight or fight mode. Adrenaline is excreted when there is danger that is whatbgivesvus our strength in a stressvflight situation.

Definitely. It's a sad and by far the most painful way for your heart to tap out.

Mostly it will cause stomach problems like gerd, and it feels like the heart.

I would think you can.
Firstly the stress of the pain. Then while you are trying to deal with that kind of pain you would not be looking after yourself very well.
Why would you do this to yourself? Not a judgemental question. But one asked with all the compassion and empathy I could ever feel for someone else.
Take care, some of the most beautiful flowers are grown in the harshest environments.

Stress and anxiety can push up Blood Pressure which in turn will damage ones heart which in turn can damage arteries so I think in the end I t could kill you