I'm with Lauren. Whenever a headache changes it's always a good idea to visit your doctor, especially if one won't go away. That way you can check there isn't something serious going on or at least get something to take away the pain.
To throw another thought out there, could this be a rebound headache? You mentioned that you have headaches for a long time. Do you take a lot of medications? especially over the counter medications? triptans? or narcotics? all of these can cause rebound headaches. There is a message thread called Rebound Headaches with more information on this site.
Good luck. Let us know how it goes.
I had a great experience with ambien...I have really bad problems with sleep...either I sleep really well and want to sleep all the time, THANKS DEPRESSION...lol OR I don't sleep and can't sleep for anything its a pendulum swing from one extent to another....
During a really bad phase I was prescribed ambien and took I think 10mg, don't quote me on that though...I did really well on it. But I found that once I started taking it I didn't want to quit, NOT THAT I WAS ADDICTED OR DEPENDENT...just that I liked the fact that I could take it and be tired and ready to go to bed within a certain time frame...usually I would need to go to bed and then go lay down and have to lay there forever and try to mentally unwind and shut down and try to put everything out of my mind and eventually fall asleep some horribly long amount of time later.
From what I understand it is only recommended that you take ambien for a short period of time (I am guestimating two weeks or less at a time??? something like that?)
I have absolutely nothing bad to say about ambien-PROVIDED you get 6+ hours of sleep...
Keep me posted?