I was injured in 1995 and have always had nerve pain-burning in my lower back. I am taking Amitriptlyn and have been other than when I was in the hospital, I was on Neurontin but did not get any relief so I switched.
The Amitriptlyn makes the burning tolerable except when I am ovulating or have my period. The burning intensifies and is on my legs and feet also. It dominates my thoughts on those days but I know it is temporary and I get through it.
I have also noticed that generally the burning is the worst in the morning before I have done my morning "program" (not to be too graphic!) Ha!
I have found swimming in a warm pool or a warm shower helps, strange warm helps burning but it does for me!
Hope this helps!