I stopped feeding when my baby girl was 6 weeks old. My doctor says that the stress in my life,?

(leaving her father, moving to a new state) had caused my milk supply to go away. I really am pro-feeding, and want to start again. I can't tell you how sad I was when I couldn't do it anymore. Is there any way to get the supply back up again now that some of the stress is gone? I would like to start agin, but I'm skeptical of "nipple confusion" and what if she doesn't get enough milk? She is almost 4 months old now.