Oh, my, Cat. I just now read this. I was worried enough about the low iron; now this too? I'm not sure how you can possibly think about an elective surgery under these circumstances; I hope you know what you are doing! I'm going to keep praying for you, cat, not only for your surgery and healing but also that there's no cancer, its a mistake or mis-read. Because if its true, I can't imagine dealing with adjusting to your new DS insides while at the same time dealing with cancer treatment.
I have to say, I am really shocked that your surgeon is operating with these unresolved questions.