In the face of normal labs, ultrasound, CT scans it is reassuring that your abdominal pain is unlikely to represent something surgically reparable. Undetected cirrhosis, pancreatitis, gallbladder stones, and complications from any of these are possible.
Since you have considerable alcohol ingestion, to consider complications of cirrhosis, it is helpful to get endoscopy to look for varicies, gastritis, duodenitis and look at the gallbladder more carefully with ultrasound.
To consider complications of pancreatitis, the endoscopy can allow for ERCP (an ultrasound that looks more carefully there) although the CT looks at pancreatitis well
To consider complications of gallbladder stones, a HIDA scan or an endoscopy can allow for ERCP (an ultrasound that looks more carefully there) and if there needs to be a procedure, one could be done then (opening up the duct or stenting)
It's worthwhile to get a second opinion, which is who would evaulate for these options.
Enoch Choi, MD