Ok,
this is one of my fafourites,when it comes headache.First,press GB-21 from boath sides of the shoulders.After you feel,that tenseness started to give in,then grab under the trapezius muscle and lift it a bit up and shake it.(this part is quite painfull)
When you press GB-21 points it will release tensness that might obstruct the blood floating to head correctly and that might cause that head ache. And when you grab under the trapezius muscle and do as I mentioned,it will bring the blood float from the lower part of the body to upper part of the body,and this will take away rest of the tensness,that still might be there.
You cant do this one to your self,but you can ask someone to do this to you.You allso might feel nausea and little bit dizzy,since the blood will rush from the lower part from the body to upper part,so be cearefull with this one...but I assure you,this one will hellp

-Mka-