Found out my Iron and Abumin is low

I talked to my surgery scheduler yesterday and she told me that the dietician is suppose to be calling me because i'm low in iron and albumin. I knew I was anemic in high school but didn't think about it much. She said that I would have to drink two protein shakes a day to bring it up and that I had to add an iron suppliment to bring my iron up. Since I haven't spoke to the dietician yet I searched around on the net to see how much iron I should be getting. I found out that a woman 19-50 should be getting 18mg a day (27mg if she's pregnant). It says that you should be taking no more than 45mg per day.

I went to the store and picked up some iron. My bottle read that it was 65mg per tablet. I also picked up a multivitamin (since I had ran out) and that bottle said that it had 18mg in it. So my dilemma is should I just take the multivitamin or should I hold off and just take the iron by itself since I have to bring my iron up? I know i'll learn more talking to the dietician but I just want to put the question out there. There's no problem with me increasing my shakes because I already have protein at the house. I just want to bring my levels up so it won't delay my surgery. She said it takes about a month for your numbers to come up and i'll be sent for more labs then. As of now I think it's late September of early October (still have 3 more months of PCP visits for the insurance company).