Nice to see you found your activation email.

Your B12 is going down. What that means is that you may be living on your stored B12 that the liver saves for us. Up to 5yrs worth, when diet is good, maybe less for other people.

I would suggest now that you start methylcobalamin 5mg a day on an empty stomach for 3 months. See if things improve some.
This is the B12 thread:
http://neurotalk.psychcentral.com/thread85103.html
this thread explains all the details.
400 is the new cut off for normal and you are quickly approaching
that low. We here typically keep our B12 at 1000 or higher.

Your A1C is not too bad. It is better than mine!
But do try to avoid sugar and white carbs...these tend to flare PN pain for some reason (if not actually cause it). This is called impaired glucose tolerance.

Do you take any blood pressure medications? Any ACE inhibitors? Any statins? Any antibiotics in the past?

Also you might want to add magnesium to your life. Since most Americans are low in this. 200mg a day of a good chelate (not oxide which doesn't get absorbed). Soaking in a tub with epsom salts really helps, as the magnesium in them get absorbed into your skin and it helps with feet and legs.

This is my magnesium thread:
http://neurotalk.psychcentral.com/thread1138.html
Some of us use a lotion... I find this easier on my sensitive GI tract, but oral will work if you use a good type.

Magnesium really helps the mitochondria in nerve cells function better.

There are other things, to do...but starting slowly will show if you get benefits from the most common supplements for PN.
If you add them all at once, you can't see which is doing what.