Upper right quadrant pain. cholecystectomy 8 years ago. pain radiates to back /shoulder and is sharp about 40 min after eating. liquid diet helps.

See your doctor: You should consider seeing your physician for further history. There are a few things that come to mind, but to make any guesses without further history would be perfunctory and inappropriate.

Pancreas: After your gallbladder has been removed you can still form stones or sludge that causes pain. Getting pain after eating around 30-40 minutes may be related to acid however. At your age a duodenal ulcer is possible. Lastly pancreatitis or inflammation of the pancreas can also be a cause. See your doctor you can be treated and feel better.