Clonazepam
"I was having severe right sided headaches for the past couple of years that started in the evening and wouldn't let me go to sleep.  I would push on my eye with my hand until it would weep because the pain was so bad.  My neurologist gave me a vessel medication which didn't change anything.  He gave me Klonopin and they were gone by the next day.  I just have to make sure I take the medicine before I get the headache.  (On a side note I have partial seizures from meningitis damage in my brain when I was two and take Lamictal and Keppra for that)."