Low iron....

I got a call from my doctor yesterday that my iron was really low. It is 6. She told me to take Feramax right away, which I'm glad to take as I'm exhausted and I feel as though I'm in a fog. When I went to the pharmacy to get my meds, the pharmacist asked my level and asked me HOW are you functioning with a level of 6?

Just curious if anyone else has ever experienced this before. I really don't like taking meds, but at this point, I just need to boost up. I feel very blah. My kids keep saying, "mommy, you JUST asked me that" ... problem is, I don't remember even asking them the question. :cry:

Also, my periods aren't really heavy, so I'm not sure why I would be low iron. I'm 43........ I don't know if that has anything to do with it.