The symptoms of nerves healing as the nerve growth cones force their way through tissue, produce weird signal patterns until completely connected, and being interpreted by the brain as parasthesas ("beyond the usual sensations") can be every bit as annoying and painful as those of nerves being damaged. In fact, many have said that repairing nerves recapitulate the symptoms of nerve damaging processes, with the difference being that the symptoms do tend to ease with time. It's hard to tell this except in long-term retrospect, however (the reason many people keep symptom diaries).

I've been through this on a number of occassions--often, the symptoms are strong enough it's hard to distinguish them from "flares". Exacerbated symptoms often start up suddenly and disappear just as suddenly.

Also, regrowing nerves are quite vulnerable to compressive forces--the nerve growth cone tips can be pressured easily as they pass around nd through other tissue, and produce weird symptoms.