i know I dont post much here.. but I figured I could chime in on this one.
I am bipolar, and thankfully when im pg my mood disorder is very much calmed down (they think its because of the hormones). Though, I guess I am lucky.
Anyhow there are meds out there that are safer than others to take for depression and anxiety. Just make sure they are well aware that you are BF. As for taking them when PG, i dont know what to tell you. Other than keep talking to your t-doc and see what "coping" skills they have to give you (as far as ways to naturally try to relax and calm yourself down).
For me, when I was dx as bipolar was when my DD#3 was about 18 months old and I was told every med they needed to try on me was a big no no in BF (they are some pretty heavy duty meds) so at that point we cut our Extended BF plans down because it was more important that my son had me, and had me there (emotionally and physically) than that he was bfed (IMHO). It was a tough call for me, but i think i did the right thing for us.
Having said that, i know this time around I might have to play it out differently. Anxiety and antidepressants alone dont work well with me.. they tend to cause other bigger issues.. so I am not looking forward to all of that.