For a little while now, i've been feeling detached from my whole self. I feel as if i'm not a part of myself. I feel detached from everything around me. I look down at myself or at myself and I feel as if i'm not even looking at me, like i'm either looking at a stranger or I feel like i'm out of my body. I feel like an alien; being in my own body. It's very hard to focus... I stay in a spaced out state and daydream. I also feel very numb, and that i'm not really experiencing things. These things only happen when i'm out in public. I feel as if my mind isn't functioning right. All of this has started happening out of nowhere. I'm thinking that my dysphoria has just gotten much worse, but i'm not sure. Whenever i'm spaced out, I make stupid mistakes and make an a** out of myself..i'm usually thinking about me being trans, or how uncomfortable I feel in my own body/living my life..
What i've been struggling with is trying to figure out if i've been experiencing symptoms of depersonalization disorder or severe gender dysphoria. i'm not asking for you to diagnose me; i'm just trying to get some ideas/opinions. I don't have a therapist appointment until sept.

Yes I have that but my spaciness comes from constant gender questions flooding my brain. I've made some majorly dumb mistakes at work that stem from these gender thought floods as I've dubbed them. It sounds like a therapist could help you sort this out.

This came after a decade of never looking in the mirror. I mean I looked at a mirror but I wasn't seeing myself, it was just someone who had to look ok before going out. I looked but I never saw myself but when the fog lifted and I finally allowed myself to see, I cried for an hour.

Not an exact mirror of your feelings but definitely touches on what you are going through.