See if you can get a script for 5% Lidocaine patches. When my feet are burning badly, I can slap those on, and they help.

OTC-wise, try some of this Epsom Lotion on your feet. Some people swear by it.

http://www.amazon.com/Morton-Epsom-L.../dp/B008X365AU

Since I came down with SFN, I've had more cramping problems. I don't have a cure-all, but I've made extra sure to drink LOTS of water, and get enough calcium, potassium and magnesium in my diet. I've just recently started magnesium chloride supplements, and they've definitely helped some muscle twitching problems I had, and the cramping seems to have dialed back a little too.

Sorry for you pain, but welcome.