Sometimes the 6th chakra gets so busy it's like a traffic jam up there. One time I had that type of headache and even my eyes hurt and face was flushed. A healer friend placed her hands on my feet and directed the energy to move down the body. I find if I focus my intent on bringing the energy towards the feet, it usually relieves the pressure in the head, just massaging the feet and bringing warmth to the feet can help.
Also a bit of peppermint oil on the forehead can help. I got this idea from the theory behind botox which was originally designed to freeze the muscles in the area which get over active. I figured a non evasive form of freezing might work. I tried biofreeze which chiropractors and massage therapists use - it chills the area. But it didn't work that well. Then I tried peppermint oil and that was effective. It chills the area and the effect lasts for awhile.
Also check on YouTube for Donna Edens method for relieving headaches, I can't say it relieves migraines but it helps open the neck area which can get rid of some of the pressure.
I should mention that I can't make them go away, it sort of comes with the work we do. I just manage them.