When I was going through Alzheimer's with my parents and my business was in trouble, I was under stress for several years. The stress became my norm, so when I was overcome by chest pains while in my office one day I was taken by surprise.
Like the article mentions, the experience was like a heart attack, or at least like I imagined a heart attack would be. I had pain in my chest and I couldn't breath normally. At the time, I had never had heart problems, but I was convinced I was having a heart attack.
What I learned is that no matter how bad your life gets you have to find a way to enjoy yourself so you can relieve your body of at least some of the stress that builds up inside, and eventually causes problems if not taken care of.