Sorry for your troubles, Steve, and have not experienced this long term with any of my neck dissections. Coud be Lhermitte's (sp) is when the standing the chin is bent forward to the chest, a shock goes through the body to the feet, and fortunately do not have this either.
FYI, there is no Cedars-Sinai in NYC, but have one in Los Angeles. In NYC it's Mount Sinai, and did not see a Dr. Stubenfield there from their listing, but doesn't mean he's not, being he's new or other reason, like doing a lecture, and is not on staff.
Good luck, and hope you find relief.