I had similar episodes in which I thought I was going to die many years ago and it was horrible, so I do empathize with what you’re experiencing. It’s very frightening and frustrating. You could get a second or third opinion, if you think that would help.

When I had multiple episodes of chest pressure, racing heartbeat, tingling, etc. , I ended up in the ER, where after many tests, found nothing wrong. I was relieved, saw my primary, who diagnosed panic attacks and prescribed medication. She also referred me to a cardiologist, just to make certain my heart was ok. I did a stress test on the treadmill, which showed everything normal. I then accepted that anxiety was causing my symptoms and went about learning all I could about the disorder and how to overcome it. I was successful and stopped having them.

In recent years, I developed health anxiety and receive talk therapy for that, which is very helpful for me. Anxiety can cause you to doubt your judgement and that of medical professionals. I’ve learned tools to help me sort through that and be at peace with my decisions.

I hope you can find answers for your situation. Did the doctors clear you for exercise? With your spine condition are you able to walk, run or do work outs? If so, that has helped me a great deal. Good luck with everything.