Hello, I was recently diagnosed with iron deficient anemia, my iron level is at a 12. I have been taking iron supplements and eating iron rich foods for the past three weeks, and I was given 2 weeks off of work( though I went in a few days). I however continue to feel dizzy, exhausted and lack concentration, and have had to continue to take days off work. How long will it take for the iron to build up in my body?