Indomethacin
"I have hemicrania continua since 1999. First attempt of indo made me ten foot tall.  Second attempt when I had stopped working worked fine.  Indo completely got rid of the pain after a few days of taking it.  Trouble is two years later I forgot to take it one day and the pain is back with a vengeance. Neurologist reckoned it should start working again after 6 weeks but it hasn't.  Now taking carbamazepine for trigemenial neuralgia."