Iron supplements, usually given in the form of ferrous sulfate, will start to take effect within the first week. However, the length of time it takes for your body to completely replenish your depleted iron stores will depend on how severe your anemia was to begin with, how long you've been anemic, how well your body is able to absorb the iron in the supplements and how good you are at remembering to take them.
According to the Three Rivers Endoscopy center in Pennsylvania’s website GIHealth.com, anemia usually goes away within eight weeks of supplementation, but you may need to keep taking the supplements for six months or more so that your body can rebuild its reserves of iron to prevent you from having another bout of anemia.
http://www.livestrong.com/article/446951-how-long-before-iron-supplements-take-effect/
Hope things pick up for you Sog.
Take care.