<font color="purple"> I used to get what I called 'migraine' headaches and had the whole schema of tests and things that you have listed. As I have progressed in my therapy and more memories/emotions/sensations are processed the headaches have decreased till the point that I haven't had a headache in over a year. My Therapist used to tell me, "We'll see if you really do have migraines, I think it may be something else," but would not elaborated on 'something else' was.
Guess what? She was right---no more headaches!

What a relief.
I'm not saying that I don't get headaches now, but that I don't get the type that required hospitalizations and medications that didn't work. The headaches I get now are relieved with the usual dose of 400mg of ibuprofen.
Summerflower, I hope this helps you a little on your quest for knowledge about headaches related to DID.
Gentle thoughts your way,
cat