I heard about a study from the University of Pittsburgh that showed that 87 percent of all physical illnesses are due to emotional factors. [That is besides the 100 percent of emotional illnesses that are due to emotional factors.]
Even if you argue with the numbers [and the ability to prove that any given illness is due to emotional factors], one thing has been proven beyond a shadow of a doubt - stress, anxiety, depression etc. compromise the immune system and cause a whole host of illnesses. Like - too many to count.
So if you emotional life is not in order - work on it.
Your life and well being depend on it.