This is only my own experience but I had a 3rd degree tear, that healed ok but I had an anal fissure that gave me pain and trauma for 3 months after. It was really getting me down but I was too embarrassed to go to the doctor. I confided in my mum and she bought me some vitamin e tablets. After a month of taking them my bottom is now back to normal! I was taking lactulose, fybogel etc but it wasn't helping. Give it a try, I credit it completely.
HTH