In 2001, I was traveling approx. 10-15 mph in a Ford F250 truck when suddenly I was rear-ended by another truck. He was traveling approx 65 mph. 
A few hours after accident I had bad whiplash pain.
Within a short amount of time after accident, I developed both migraines and hypothyroidism.
I am now 56 yrs old and post-menopausal and suffer terribly from migraines. I have suffered from them since the accident. I have approx. 4-5 migraines per week. 
After learning a little bit about whiplash, I am beginning to wonder if the problem with my migraines is that my head is too heavy for the potentially damaged ligaments, etc. in my neck and perhaps elsewhere.
If I am upright for too long, my neck begins to hurt which is most often an indicator that if I don't lay down immediately, a migraine will happen. Even when laying down, I still may end up getting the migraine.
Additionally, something that could well be a factor is something that happened in my 8th grade year. I was playing catcher in a baseball game at school (with no helmet). I was excited to get to play this position and thought I was big stuff. I called timeout in order to sweep off home plate with my little broom. Apparently not a soul heard me call timeout. The pitcher pitched and the very athletic, beefy girl, up to bat, swung for a homerun and instead of hitting the ball, she hit my head. Apparently, I was knocked out immediately. I was told that I fell onto my back and that both of my legs went straight up into the air. Everyone thought I was clowning until they realized that I was unconscious. I have no idea how long I was out. I will guess 10 minutes or so? 
I've often wondered if the car accident jarred this old injury awake, so to speak. I have no idea and may never know.
All I know is that I have almost no life due to the migraines and I do suffer from depression as well.

What I most need to know is whether or not you accept Blue Shield of California insurance. hmo. After hearing about prolotherapy, I wondered if this could finally be the answer but then wonder if it's too late because it's been 21 years since injury.