Hi: Thoracic injuries can cause problems below the waist. I would call Scripps or UCSD, and ask if they have the type of Dr you're looking for. If you're having bladder/bowel probs, see a Dr asap.
I've never had surgery on that area of the spine (only lumbar), but I have ddd throughout all levels, and severe headaches aren't unusual for the type of injury you have. Who ordered the test you had? Did you have a Dr and now need a new one? If so, can that Dr refer you to a specialist?
Scripps is really good, and I don't know much about UCSD other than it's a Univ Med Center, so they would have PhD's in the field your looking for.
Good luck, and don't wait too long with this