Respected user , Hi
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I have evaluated your query thoroughly .
*  Long term 
indigestion with normal work up usually indicate altered bowel
    flora mechanisms .
*  Need  detailed  case study  with  thorough history , physical examination   
    study  of  done  reports  with  necessary  further  evaluations  to  reach
    at  the  root  of  the  condition .
*  General measures  to  get  better  recovery 
-  Drink plenty of liquids .
-  Soft , light diet at intervals with plenty of  high fiber content .
-  Avoid all oily , spicy , non veg , chilly , beverages , high caloric , dairy fat
-  No  
smoking , alcohol .
-  Regular walking , exercises , 
YOGA .
-  Avoid prolong fasting , over eating .
-  Do not  rest  for  3  hrs  after meals .
Hope this clears your query .
Welcome for further assistance .
Regards dear .