I also experienced extreme bottom dysphoria. It was completely disruptive my whole life. It definitely got worse the longer I was out as trans. There were so many things I wanted to do that I didnt feel like I could. I'm very inclined towards feminine clothes and presentation and I pretty much never could wear anything explicitly fem. I always wore baggy clothes, hoodies and jeans in the middle of summer kinda vibe. It was awful genuinely I hated my body and wanted no one to ever see me. I didnt swim for over a decade. I felt out of place among other women, I felt repulsed with intimacy and avoided it as much as possible. I got misgendered a lot and just sort of accepted it. I was very unhappy most of the time.
I dont have any easy answers. It nearly killed me. I coped badly, to make a long story short. I waited a long time for surgery and getting it saved my life. Its been over 2 years now. I'm almost an entirely different person. Its hard to really summarize all the changes but I actually like who I am today. I love my body in spite of its flaws and I actually feel free to be myself, something I never did before. I'm better adjusted emotionally and much better at managing my mental health. I'm not entirely free of dysphoria now, but bottom dysphoria was far and away the worst for me.
The next 6 months before your surgery date will feel like the longest thing ever and also retrospectively like the blink of an eye. A light at the end of the tunnel exists. I'm very excited for you to get there. Be patient with yourself and focus on getting through each day.
You have wildly misunderstood what TERFs are. They're buddies with anti-abortion activists. Politically they are aligned in interests with misogynists. They believe that gender is innate and unchangeable, which is the same thing that misogynists think. They believe that women are and will always be subjugated by men because men are biologically inclined towards rape and are categorically stronger than every single woman. They dont actually seek to change this in any material way. They just dont want to have to be around people they consider disgusting. They want to be upheld by white men the way they were in the 40s. There's a reason TERFs skew middle class and white.
Fun fact that during the build up to world war 2 a mass exodus of former suffragettes to the side of fascism took place in Britain. Even though fascists wanted to take their right to vote away again. The fascists upheld white British women as the pinnacle of femininity, and upheld them as an ideal in their state of subjugation. This presented a position of privilege over other women. It afforded them status and protection that being a political radical did not.
Not necessarily directly related to TERFs, just wanted to point out that if incentives exist to become a misogynist then some women will take the incentive.