migraine
"In my teens I suffered migraines quite frequently, but took no medication. Now they come on once or twice a year.  

I experience visual distortions before the onset of a migraine, and experience nausea and sometimes vomit during a migraine, which lasts a few hours.

If I take a couple of Cafergot tablets during the visual distortion stage it is usually prevents the migraine. Once the headache sets in taking any medication is ineffective.

I discovered Cafergot when I spoke to a pharmacist years ago here in Thailand, where it is available over the counter, without a prescription."