thanks for your question.
enlarged lymph node in pancreas can be caused by non specific inflammation, viral infection or from chronic pancreatitis in response to bile irritation.
rarely, this can be an initial finding for pancreatic cancer.
but, you should have other symptoms as well like weight loss, appetite loss, stomach pain etc.
5 mm lymph node is not that big to worry about.
it can be monitored periodically every 6 months.
this is likely related to the underlying disease process --sarcoidosis.
bile leak as i suggested earlier can cause severe pain & inflammation in the surrounding area including the lymph nodes in the pancreas.
you will require another exploratory laparotomy to remove the granulomatous tissues & scar tissues in the gall bladder bed. this is causing you the pain.
please consult with your GI surgeon.