Memory problems and reconstructing yourself

What it says in the title, basically. I know that spotty memory is a common symptom of depression, which I know I have, but I feel like it was exacerbated by the years I spent dissociating through another identity. I can barely remember how I felt before I started experimenting with gender (about a decade ago) and the last three years since starting medical transition have especially been a total blur. How do you go about rebuilding your identity as the sex you were born as when the whole process took so much out of you? I barely know where to start since so much of my internal motivation is just totally gone now.