Kinda like someone is stabbing something sharp into your head? If so, welcome to the world of Ice pick headaches.
I get these too from time to time. Aleve has been the only thing so far that has taken the edge off of them for me. Some of them have been a warning a flare was coming, some have not.
I'm not quite sure what causes these, and now that I think about it - I've forgotten to talk to my neuro about these.
Hope you feel better soon.