Hello,
I can't speak on the testing/numbers.
But some things came to my mind while reading your post.

With the multiple issues, I would seek out experts concerning each one.
Or find a very good primary care that will refer you out to specialists..

Other things to consider - possibly a nutritionist, naturopath or other alternative care options like acupressure and such..
Maybe even body worker/ therapeutic massage to help with stiffness..
Our PD forum mentions bicycling/ or bike machine for a good exercise.
It may have some relationship to the rhythm of pedalling for smother walking.

We have a few forums here that can fit for you, explore the site and also use the search feature to find specific keywords/topics..
http://www.neurotalk.org/