Thanks for posting your query.
Are you suffering from any gastric upset like abdominal bloating
, nausea, abdominal heaviness?
Pain on eating indicates only 3 disease: Peptic ulcer disease
, acute cholecystitis
, acute pancreatitis
Pain on right side of abdomen with increasing on respiration indicates "Murphy's sign", a sign very specific for acute cholecystitis.
You should consult with physician and go for ultrasound imaging. If USG is normal then you should go for endoscopy and serum amylase.
Get well soon.
Hope for speedy recovery.
Dr. Mayank Bhargava