Hello dear Warm welcome to Healthcaremagic.com I have evaluated your query for your dad in details . * Primary guidelines for better recovery 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 . Avoid late night parties , dinners . Keep the head end of the bed elevated for 30 degrees when resting . 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 . Hope this clears your doubt . Wishing him fine recovery . Welcome for any further assistance . Regards take care . Dr. Bhagyesh ( MS , FMAS - consultant surgeon )