Thanks for posting your query.
Pain after eating is possible in cholecystitis
and peptic ulcer disease
Pain due to gall bladder stone
is because of development of cholecystitis (swelling in gall bladder
Gall stones causes pain in right upper quadrant of abdomen and patient may develop fever, vomiting and yellow discoloration of sclera and urine.
Digene is effective for acidity problems and have no effect on gall stones.
You should consult with internal medicine specialist/ gastroenterologist and should go for thorough check up.
You should also go for repeat ultrasound imaging for detection of gall bladder wall thickening.
Your grand mother should take small amount of frequent meals.
Hope that helps.
Dr. Mayank Bhargava