Michele, if i remember right your PN was caused by diabetes, if so the supplement Alpha Liopic Acid may help, it can lower your blood sugars so be careful of your sugars levels going to low if your taking diabetic meds like Metformin that do that as well.
http://www.mayoclinic.org/news2003-rst/1733.html

I am with Joe about the water & B1 taking in divided doses during the day, or possibly even the stronger form of B1 [ Benfotiamine ] may help.

In the early days of my PN, the burning was getting to me during the day, that much that one day i phoned my neuro and asked for help, i was taking Endep at night [ Amitryptiline ] and he told me to take 25 mg of Endep in the morning which did help a lot, some people can't handle this med but i didn't have any big problems with it, may help to ask your doc to adjust your meds your currently taken.

i hope the burning settles down for you soon,
Brian