I would call Mayo's billing and explain your situation. They may be able to suggest something or I think some are non profit so will work with you? I am not sure about Mayo though.
As for the pancreatitis and I guess I am asking you this does that create nerve problems? My past pancreatitis issues and now nerve problems I never thought of a connection.
You stated gi issues but what about bowel problems?
I know you stated you are not being treated with any meds but I wonder if you have tried any dietary changes? Have you thought about seeing a pain doctor?