Coming from the other side of the tree, as I am a 100%, vanilla, male and have been 24/7, U-IC for near 46 years and married even longer. I can fully understand the want to be open with your dear gf.
Many members from the AB/DL and IC groups here have faced like wants as being honest and open is just so much more the way to live. That said, you are bringing a very large plate to the table and it is possible that she could be overwhelmed with all of it at one time. However, once you begin the discussion it just may keep flowing.
You classify as IC (Incontinent), if that is a reality and you have been seeing a doctor, this maybe the best place to start as there are defined discussion points and real World requirements. Understanding that everything else can be seen by her as you being a totally different person then she believed she knew, which is, kind of like, meeting a totally new person for the first time. Those many steps in developing a trust relationship has to be talked through. Another way of looking at this; when you look in the mirror in your male-self and than step back into the mirror with your 'she-self' you are likely faced with two very different individuals. She is likely faced with the same reality.
I commend your want to be honest as far too many here have attempted not to be and have suffered from the effects that dishonest brings!