A.S.
I have been on Zoloft for about 3 years specifically because when I started I was nursing my son who was just a little younger than your daughter. There are good studies on Zoloft and breastfeeding and only a very very small amount passes to the baby and it is not enough to be harmful. It is not primarily for anxiety but I have anxiety issues as well and my dr. said that it helps with that as well and it has been a wonderful help to me just getting by from day to day without worrying about everything. Just maybe something to think about that might be a possibility.
***Just wanted to add to say...Please don't feel pressured that you have to stop nursing because you need to do this for your health. There are plenty of options that are compatible with breastfeeding and alot of docs and others like to try to pressure you since they are past 12 months they don't "need" it anymore. It is still just as good for your child as it was when they are younger and if you want to continue the nursing relationship with your daughter there is no reason why you needing to take something should interfere at all.