ttc and schizoaffective disorder.

I have had three diagnosis in my life first it was a mood disorder, then it was schizophrenia (which I highly doubt because of the lack of schizophrenic symptoms I mean maybe I had one symptom if that) and finally it was schizoaffective disorder. I think schizoaffective disorder maybe correct as I have the most symptoms of that disease.
Anyways, last time I was hospitalized was after the birth of my son. I got ppd. I was also fighting with my husband near the end of the birth and had difficulty getting along with people. I sent him lots of weird long emails that he didn't have time to read where I ramble on about my feelings. I sent them to my family as well and I later read the emails again when I was healthy and they didn't really make sense.
Anyways, I want to have another baby but this time I planned to be on medication so I don't get psychosis and ppd because clearly I am at risk of getting it. I want to know what other schizoaffective moms did during their pregnancies? And what they did during nursing? I believe nursing is best for the baby over formula and I want to find a medication that treats my illness and it's harm is less then the benefit of nursing.
Please advise me with your personal stories.
I have a doctor who knows about psychiatric illnesses a little bit so she helps me but it's good to research it on my own.