Two weeks?!

So, my doctor called yesterday with my lab results and told me that I have something called Grave's Disease. There are 3 treatment options, ALL of which require immediate weaning. I thought I had some time to wean, because from what I read I could take one of the medications while breastfeeding, but my doctor said I should only be nursing once a day if that, and if I was still nursing, Paislee would have to have routine blood tests because there are chances of liver failure for her (and I) if I am nursing while taking this medication. I just can't take that chance so my only other option is to wean her. That would be okay, if I could take it slowly for her and I and give her time to adjust, but my doctor wants her weaned in TWO WEEKS so I can get started with treatment ASAP. Does she know how hard that is? I don't even know where to start. Prayers appreciated :)