Your symptoms could be SO many things including microscopic sludge/stones in the common bile duct, gallbladder problems, Sphincter of Oddi Dysfunction, Small Bowel Bacterial Overgrowth, acute
pancreatitis, chronic
pancreatitis, autoimmune pancreatitis, mininal change chronic pancreatitis, etc., etc., etc.
There are two relatively non-invasive procedures: 1) Endoscopic Ultrasound (EUS) and 2) MRCP-S (Secretin). The EUS can image the pancreas and ductal system.