It is very difficult to know how best to help a family member or friend with a severe headache. Likewise, just as difficult to help yourself if you are the victim.
Either way, the more you know about headaches in general and the easiest ways to relieve them, the better. The Mount Sinai Medical Center in New York has created a wonderful infographic that teaches you all about the different types and severity of headaches, and how to treat them. (reprinted below with permission)
Of course, if you find that your headaches or those of the person you are caring for seem to persist without relief, then you need to see a doctor. Most primary care physicians can recommend a headache specialist if necessary.