*Something* leads to anxiety, anxiety leads to stress, and stress leads to suffering.
I generally go around with a bad feeling for some time. I'm not sure where that comes from, even today. I can go around with it for weeks or even months. Then I find myself having trouble sleeping. As time progresses, I find myself feeling tense. I can get headaches, stomach-aches, even a burning sense of pain in my chest, arms and legs, and my heart is racing. That plus stress and anxiety leads to the inevitable realization that I am seriously ill. Just two weeks ago, I was sure I was dying. I knew I had been suffering from stress before, but I never felt anything like this. Right? No. It couldn't have been this intense before.
It took a lot of focus from me. Instead of relaxing, I examined myself. Finding patterns. I started avoiding stuff like eating. Tried to sleep more. Having long walks. But nothing seemed to help.
So I checked the web for possible explanations of chest-pain. It must be angina or atrial fibrillation, I thought. Then I reached the page listing diseases with the symptom of chest-pain. AND IT ALL CHECKS OUT! But I'm so young! And I've been living and eating healthy! Oh NO! OH GOD! IM FREAKING OUT!
And then I scrolled down a bit. It turns out my symptoms are usual for lots and lots of different diseases. Most commonly stress. And that's me in the grip. First up, a period of fear. And then I feel stupid. Suddenly, my heart wasn't racing anymore. And I can sleep again.