migraine
"Have had migraine for 33 years.  Experienced first one after giving birth for the first time.  Migraines are very severe and symptoms include non stop vomiting, lack of balance, loss of sensation, sensitivity to light, sound, etc.  Rizatriptan works for a migraine attack which is not so severe.  It has to be taken immediately.  I usually lie down quietly for 20 minutes after taking it and then it works.  It does not completely get rid of the headache, but suppresses it.  This allows you to get on with your day.  It makes me very tired, and makes my body feel heavy.  Reactions are sometimes slower, so don't drive.  If it does not work within 20-30 minutes, then it won't.  "