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This is what I did the first week. I'd go to a quiet place and try to be calm and tell myself this -
You are 100% normal.
You are 100% mechanically normal.
You are 100% bio-chemically normal.
There is nothing structurally wrong with you.
Your brain manifested itself into migraines because you were incredibly stressed and pressured.
Then, I would mentally list the things I went through around the time my migraines started. Be as patient as you can with yourself.
While I was mentally listing, I would try to catch the emotion that I was feeling. Sometimes I could recognize it right away, sometimes I'd just have to settle on one from the past.
Once you think of one emotion or 2 I would relate it to something I went through.
Then, I would try to stay really calm and imagine that emotion and experience starting at my toes and moving up my body. Go really slowly and try to breath deeply and slowly. Imagine these emotions physically in your body working their way up and go through each body part slowly (toes, feet, ankles, calves, knees.. etc.)
When you get to your head, really stop and breathe and put those emotions/situations into a balloon. You can do them all at once or start with a new one and collect them at the end.
When you really feel you have calmed down and are ready to let go of those emotions metaphorically and visually let them go into the air. Wave good bye to them. You can even color code different emotions of balloons and keep repeating day after day.
Once you really let them go then start to mentally list all the things you will do once you start feeling better.
Lastly, I would thank God for everything I have been through and then I would mentally list everything I am grateful for.

This would all take about 20-30 minutes. I did it for about 2 weeks twice a day. Then, all of a sudden I didn't have to do it anymore. Not that my pain is gone but now I'm on to new mental exercises. This is what I did at first and it really got me through the first couple of weeks when my anxiety was high.