The hematologist should help. Make sure to tell him that anemia has always been an issue, not just during this pregnancy. There are some kinds of inherited anemias that don't respond to vitamins and iron. Also, much rarer, is B12 deficiency due to an inability to absorb B12 - not too likely, but ask the hematologist about this too.
They will probably give you a RBC transfusion. Just giving you iron would give you the basics you need to MAKE more blood cells, but your body can't make them that fast - takes a few weeks.
