--this seems to be due to the lack of conflicting sensations competing with the pain that are more prevalent during the activity of the day. Pain signals are actually the slowest-travelling signals in the nervous system, so that can be interfered with or out-competed by other sensations, but when these oter sensations are in short supply . . .

If you're having actual nerve pain, BTW, there are lots of other things you can try that are generally more effective than what you reported taking--have you ever had any trials of anti-epileptic meds (i.e., Neurtontin/gabapentin, Lyrica/pregabalin, Topomax) or anti-depressants (such as Elavil)?