Hello motherkat. That is good your son has no pain. Was the anaemia caused then by low level bleeding from stomach wall?
Has the specialist put him on any other medication to try first?
I was initially just on Omeprazole to reduce acid in stomach plus iron to replenish iron stores.
After very large bleeds had to start Budesonide.
If you unsure why not talk to Specialist again or seek a second opinion. Seems though as disease so rare very few gastroenterologists have treated CG. Did your sons gastroenterologist diagnose on first Gastroscopy? If so he/she must have viewed condition before.