Lisa, do you have a registered dietitian that helps you with your
     Crohn's disease?  If yes, talk to her/him about your chronic low iron
     status.  It is very possible you are extremely low in other nutrients,
     in addition to iron,  such as folic acid and zinc. The lab tests are
     also needed to identify what kind of anemia you have.  If you do not
     have an RD to talk to, contact the WIC Program -- they have
     nutritionists on staff.