I would stay away from Dr Walker in Dallas, he is a freaking nutjob.
Dr Casaly in Grapevine is really good, he runs the Headache Center of North Texas, I think out of all the neuro's I've seen over the years, he was my favorite. (I've had migraines for the past 10 years and seen several neuro's and tried lots of medications.)
Be prepared to be put on lots of medication to "control" your migraines though, probably Topamax will be the first thing they give you. I HATED being on the medications, (hated feeling drugged up constantly, really out of it, kinda jittery and super thirsty, just depending on which medication I was on at the time, plus they didn't really help with preventing my migraines that much) so I just dealt with my migraines over the years.
The BEST thing I found to help my migraines was regular, intensive massage. (By regular I mean at least once a week, maybe even twice a week for the first month or so) Once I got my body back in working order, my migraines faded away and now are a rare thing for me.
Good luck mama!!!