Headaches are the worst.  They can make you irritable, unfocused, and can ruin your day.  Headaches are one of the most common nervous system disorders according to the World Health Organization, affecting around 50% of the global population at one point during the year.  There are several classifications of headaches that may start for a myriad of reasons.  The biggest question we all have is, "how do I make it stop?".