My Hematologist wanted me to do the Endoscopy also but I didn't do it. Also wanted Colonoscopy too but haven't done it either. (I am overdue for that one so need to get it done at some point) I still suggest going to Hematologist rather than a Gastro. It is a blood issue and that is what the Hematologist does. I didn't need a referral to see one. I am taking an iron supplement also and have received two infusions. The infusions really helped. Good luck!