Well, without a clinical evaluation it would be difficult to comment specifically on the situation. If there has been an actual nerve injury 3 years back it is unlikely to heal at this stage, tough this should not be responsible for pain. Other possibilities that may need to be considered include recent nerve injury, nerve impingement/ pressure, neuropathies, neuromas etc. I would suggest getting this evaluated by a neurologist for an accurate diagnosis and appropriate management.
Hope this helps.