If your doc knows an anus from an ulna, then he/she would be inclined to draw blood to check serum levels of folate and cyanocobalamin. Afterwards, replete the iron with this classic protocol:
Week 1 - 1,000 mcg iron dextran IM Qday x 7 days
Week 2 - 1,000 mcg iron dextran IM once
Week 3 - 1,000 mcg iron dextran IM once
Week 4 - 1,000 mcg iron dextran IM once
Week 5 - Recheck Iron studies with ferritin, folate, and B-12.