migraine
"I have suffered migraines since childhood 2-5 migraines a year. Then at about 38 I started getting these horrible severely debilitating headaches 1-3 times a year and the headaches would last up to weeks with intermittent increase in severity.  I was finally diagnosed with cluster headaches and prescribed Rizatriptan. If I feel the onset it diminishes the intensity and duration. I have been using it for 2 years and very grateful."