I thought I had all kinds of physical ailments which of course I didn't, I was a hypochondriac, and I knew it. Eventually it wore off, and I went on with my life. I think it's a conditioning factor, if you constantly believe there's something wrong, you'll have a number of diseases in your mind, and the internet makes it even more convenient for your pretend performances.
I've always tried to be the best that I could in work, and that was my priority, we all have different priorities, work, relationships, hobbies, our selves.
I disagree, many people for one reason or the other are compulsively thinking about them selves. Every little ache, or feeling of discomfort is the onset of a deadly disease. Hell, I was like that, an only child wrapped up in myself, I had my compulsions, and still have a few to this day. But it is based on conditioning, something that you continue, even though it's a pain in the ass to admit.
It takes self control to put an end to these compulsions, these self harming procedures many of us go through. Call it what you will, anxiety, stress, what ever, we all deal with them in different ways, these habits, these creations that become reality when they're from our vivid imaginations, a 4 star movie that is played with the same actors, same script with all of the lines memorized, conditioning.