Movement associated/induced migraine. I cannot jog or do high impact sports for the same reason. In fact sometimes just any type of physical exertion can trigger one.
There is quite a few references on the internet related to this. I believe there are some old postings on this forum as well in regards to this.
I am so sorry that you are going through this. Not fun at all, especially when you've made such a valiant effort at getting excercise.
I have found that chiropractic therapy helps with this. Maybe consult a physiotherapist. But definately discuss it with your doctor.
Good luck to you,