Hi,

It sounds like you have had a difficult start to motherhood. You've done a great job feeding your baby so well for so long.
Are you getting treatment for your pnd? It is probably important that you get appropriate treatment ASAP - you don't need to wean to start on medication for pnd (if that is thought by your health care providers to be the best course of action for you) Being adequately treated might make the changeover easier to deal with.