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I have evaluated your query in details  .
*  Guidelines  for  better  outcome for  gastric  issues  
Prefer soft , light , bland , vegan diet till possible .
Consume more of whole grains , cereals , pulses , legumes , organic fresh fruits .
Avoid  all oily , spicy , non veg , hot beverages , junk foods , carbonated drinks .
Avoid over eating , prolong fasting .
Avoid resting upto 2 hours after meals .
Fix your timing of breakfast , lunch , dinner  till possible .
Have  regular walking in fresh air , exercises , YOGA .
Avoid smoking , alcohol if consuming .
Avoid stress , 
anxiety .
Manage  to have regular sound sleep of 8 hours .
Intake  of  
Proton pump inhibitors as 
omeprazole or 
pantoprazole on empty
stomach  1 hour prior to lunch  ;  antacid  syrups  as  mylanta or others according  to the  advise of your doctor  helps .
Keep your  BP , blood sugar , 
cholesterol , body  weight  under  control .
Later on may need  
ultrasound  or  upper  GI  
endoscopy according to the progress .
Wishing you fine recovery .
Feel  free  to ask any further doubts .
Regards  .