I see a lot of ppl here talking about treating the pain of a migraine. I have been a migraine sufferer for most of my life, and the best advice I can give here is this....Whatever pain medication you take, you should take it ASAP. I have found that the more time the headached has to build up without the pain medication, the harder it is to get under control. What this means is that if you go to the ER for pain, your pain will probably be so horrible by the time they get to you, that you might have been better off with some ibuprofren at home at the first sign the headache was coming. Your doctor should be able to give you a prescription that you can keep on hand in case the migraine comes.
I have had to resort to the ER a few times...and what an aweful experience it was every time! THe bright lights....the stupid questions....the dumbfounded looks....the stupid comments like, "oh....heh...you just THINK your hand is going numb b/c you are scared"