My son was recently ex with esophageal enteritis. This after 4 months of severe stomach pain and vomiting. A ct scan at the er in nov showed liver me titling and gall bladder inflammation. He saw a fad this past mon who started him on a med dys... ? And to return in 10 days. However just today the dr called and wants to see my son tomorrow, only 3days later. Dr also wants fasting blood work done. My son is concerned as am I. Any info?