Hello dear
Warm  welcome to Healthcaremagic.com
I have evaluated your query in details  .
*  Fissure is recurrent condition even after any intervention as Lord`s
    dilatation or other intervention , so it is best advisable to keep it under
    control with necessary precautions only .
*  General measures to keep it under as less painful condition as possible :
Drink plenty of liquids .
Prefer  soft , light  diet  with more of green leafy veg , whole grains , cereals ,  pulses , legumes , organic  fresh  fruits .
Avoid  all  types  of  oily , spicy , non veg , hot beverages , junk foods , dairy fat .
Bulk forming laxative as Ispaghula husk 3 teaspoonful  at  night  with a glass of drinking lukewarm  water  helps  by  smooth bowel  evacuations .
Tab. 
Ibuprofen ( 400 ) mg after  meals  for  control of pain , burning .
Xylocaine ( 5 % ) jelly application over the anal part gives soothing  action .
Sitz bath ( sitting in a tub filled with lukewarm water 5 minutes each  3 times a  day  and  additionally  after  passing  stools ) helps .
Avoid long drives , sitting prolong on hard surfaces .
Control of blood sugar , 
cholesterol , body weight .
Avoid 
smoking , alcohol if consuming .
Hope this  will help you for sure   .
Wishing you fine recovery .
Welcome for any further  guidance .
Regards  .