iowasugar, Welcome to HealingWell
I have found the support, validation and encouragement that I receive here, to be so helpful and healing. I hope and trust that will be your experience as a member of the HW family.
I am Kitt and I have depression and have lived with it for 28 years now. What I first noted in your post was your comment "My fiance and I have been together for about 6 years ". I wondered why you would be together for 6 years, have a son and not take the leap of faith and get married? Now I am not being judgemental and just living together with a significant other without marriage is acceptable but then why are you engaged? You of course owe me no explanation, I am just tossing out a thought.
I am headed toward committment with my wanderings. :) My husband does not understand the depression and there are times he is beside himself trying to figure out how to deal with my depression but he is still supportive and will even go to the physicians with me and speak up on my behalf.
I think you made the right choice by seperating for now. You must do this for you and your son thow, not for your fiancee as he needs to deal with his issues and first he must accept that he has issues and face them.
You sweetie need to work on you and how to move on with your life and your sons. Someday you and your fiancee may work things out but right now you are being very wise and brave and learning to advocate for you. I am very proud of you. I know it is heart breaking when people don't understand but we here all understand so stick with us.