Thanks for posting your query.
Increasing abdominal pain
after meals occurs only in 3 conditions: cholecystitis, pancreatitis and peptic ulcer disease
may be in favor of cholecystitis or gastroenteritis
Possibility of gastroenteritis appears to be high as infection may persist for months.
You should consult with internal medicine specialist and should go for thorough check up.
You should also go for ultrasound imaging, liver function test, serum amylase and endoscopy.
You should take complete antibiotic course, probiotics and antispasmodics for getting relief.
Avoid milk and milk related products such as butter, cheese.
Dr. Mayank Bhargava