--that have a relapsing/remitting character to them, most notably certain variants of chronic immune demyelinating polyneuropathy (CIDP), but this is not common.

On the other hand, many of us with varied neuropathic conditions have good and bad periods and experience "flares" that eventually dissipate back to baseline levels.

Also, consider the possibility that you are getting some healing/regeneration. If you have corrected those vitamin levels (that B12 level in particular was quite low), you may be experiencing that. Many people who have gotten better, though, say it is not a steady process; there are peaks and valleys, "flares" that then get better only in long-term retrospect, and often some rather odd sensory experiences as the nerves regrow and reconnect themselves.