Axonal PN

I was told I have Axonal PN about 5 years ago.
I had tingling and numbness in my feet.
It did not bother me much untill 2 years ago.
Then I started to feel weak in my lower legs.
This got progressively worse until 2 weeks ago.
Then it got much worse, so that my legs got very weak.
They would get quite tired when I walked very long.
I used to walk a couple of miles a day.
Now if I walk 1/2 mile I am very tired.
My muscles do not recover very fast at all.
It will take a day to recover.
I went to a neutritional doc a week ago and he prescribed Metanx.
I have been on it about 4 days now.
Can't see any improvement yet.
Anyone else have this kind of PN?