Hi Chrissy,
Good to hear you have been able to work through some of this and are a bit more settled. You said, "I can't help but think that part of this could be because I am married and have a 5yr old." There may be a slight element of truth in this; however I see it more an effect, than the cause. Don't get me wrong; it still remains a significant issue. Fortunately enough your SO is with you on the matter and your 5 YO will adapt to having 2 "Mum's' much easier that at a later age.
Brain sex (the cause) is a complicated issue, particularly when it remains dormant for some time, and then decides NOW, is a good time, to make my true self be known. Changing hormone levels in the body, either naturally or artificially may change the way you think. This sometimes clouds your cause and effect preception.
Try and work on the guilt factor. This is a very often misplaced emotion that robs you of your correct perspective. What you are experiencing and have experienced over the years; - is not your fault - . Its the result of a complex mix of genetics, hormones, chromosomes and environmental factors. It's something GIVEN to you, you haven't CREATED it. Hope this helps in some way. In the meantime, be safe, well and happy
Lotsa luv
Catherine