Sending a lot of moral support about the migraines!
Regarding the book, I think that we DO need different books written by different people who all say "the same thing" (aka the Useful Things That Work For Real). There are many different persons out there who will need many different ways of explaining the same things. Some will need it written by experts, wome will need it written by the survivors, and so on.
If reading a book by a DID person could encourage other dissociated/traumatized persons to look for the proper help, because they can see the proper therapy is useful and does no harm, then you book is worth publishing and reading.
It also means that you are saying the right things in your book, btw. Compared to other DID persons who went on TV in my country and spent 2 hours explaining that DID cannot be cured, describing cooperation between the alters and calling it "functional multiplicity" and "the best a DID person can do" and other stuff like that.
The world needs more DID people showing that healing is possible, that there is hope, and how to do it.
Your work is worthy.