The person who did the Reiki Patty, must have released a blockage, as the Reiki can not cause harm. Your friend must have had a lot going onfor a migraine to start up that bad.
I had a wonderful Lady come to me, who had just got over bowl cancer. She also had Rhumatied Artherites, Diabetic and also suffered with depression. She also had problems withher right arm which she could only move so far. She also used sticks to get about.
After the first session the lady was able to move her arm, also she felt more relaxed and also sincethen whichis now 2 years ago, she has not had to use her sticks.
Reiki is a wonderful thing, it goes to where it needs to go first, even if you dont feel the pain in that area, it has to unblock other areas first, which could be the root cause of the pain you feel.
Don't allow thesession your friend had to put you of. Its not like that with everyone.