34 weeks pregnant very low iron?

I'm 34 weeks pregnant and my iron levels have been low the entire pregnancy. I took iron pills & ate foods loaded with iron and nothing helps. I had gastric byp surgery in 2001 which is why my body just doesn't absorb it like other people. Well, since becoming pregnant it has gotten very very low. I was given IV iron for weeks 26-30. It helped a little, but not very much at all. I am starting to get the rapid heart beat & having a lot of trouble breathing, which I was just told could be my iron getting low again. It actually hurts in my chest. What are the affects of low iron to myself? I know the baby will just take everything he needs, so he will be fine. But how can it affect ME? Would my doc induce because of it?