The scenario that you have described is possible with chronic pancreatitis. Certainly, medications or alcohol can cause pancreatitis. Here is a list of some other causes:
Alcohol abuse
Hereditary pancreatitis
Ductal obstruction (eg, trauma, pseudocysts, stones, tumors, possibly pancreas divisum)
Tropical pancreatitis
Systemic disease such as systemic lupus erythematosus, cystic fibrosis, possibly hyperparathyroidism
Autoimmune pancreatitis
Idiopathic pancreatitis
Mutations of the cystic fibrosis gene
Further evaluation can be done with an MRCP or endoscopic ultrasound if the ERCP is not-revealing. If there continues to be pancreatic pain, you may want to consider discussing whether pancreatic enzyme supplementation can help - it has been shown in studies that supplementation can help the pain associated with chronic pancreatitis.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Thanks,
Kevin, M.D.
Bibliography:
Freedman. Etiology and pathogenesis of chronic pancreatitis. UptoDate, 2004.