have you poked your head in the ON forum
http://neurotalk.psychcentral.com/forum105.html
was just thinking maybe read some of the post and see if someone else describes what you are going through. they have an injection and 8 months ago I knew what it was called, its to help with the ON headaches, I do not get them a lot but when I do, ice is my best friend, my cousin lives with headaches 24/7, it isnt easy,
(sorry for the derailment of the thread, now back to our regularly scheduled program)