Almost everyone at some time becomes anxious about his health.  Even people who can stay calm through a stock market crash can get worried about new or nagging symptoms.  And while some anxiety about our health is perfectly normal, in some it can reach a level that interferes with day-to-day functioning and becomes incapacitating.  Even when it’s not that bad, anxiety about health is frequently misguided.  Your headache is thousands of times more likely to be due to muscle tension than a brain t...