Butterfly, you are back where you started, no worse.
There have always been single sex loos.
When you transitioned a decade prior to the Equality Act (and presumably before the GRA), you chose to use the ladies', presumably gambling that you would fit in best there and not trouble anyone. If you got away with it, then your gamble paid off.
The Equality Act, while generally aiming for uniformity, recognised that there are plenty of occasions where we do need to discriminate. This is true of all protected characteristics. Single sex loos are one such scenario. So, the Equality Act said "this new law doesn't apply to single sex loos". (I'm massively paraphrasing).
Stonewall et al then spread the idea that "woman" was a category anyone could opt into.
The Supreme Court have now clarified that it's not and never was.
So, what's really changed for you? If you go into the ladies' loos, you're doing so on the same grounds as before - i.e. you're hoping nobody will notice or mind.
I've referred throughout to "you" and your decisions, but the other dimension is how service providers interpret the law. Some were following bad guidance, which has been found to be unlawful. So any service providers stating "hey, anyone can use the ladies'" are the ones that have been breaking the law, as we now know. You aren't personally subject to the Equality Act, but obviously you can be asked to leave if you were making other patrons uncomfortable or intimidated. If you never had any trouble before Stonewall law started doing the rounds, then maybe you won't have any trouble now either.
You clearly don't like it, but that's the situation. You never had a perfect right to use women's facilities.
Also, nobody will bat an eyelid if you use the unisex facilities. Nobody is going to be watching you and thinking "OMG, I thought that was a woman, but now that I see her going into the unisex cubicle, I realise it's a trans person!". They either could tell already, or they won't think anything of it. Plenty of people use unisex cubicles for one reason or another. Disabled, baby changing, embarrassing health condition, prefer it for some reason, etc. If the unisex cubicle is the closest and most convenient to me, I'm not going to avoid it in case someone thinks I'm trans. (I might avoid it because men have probably made a mess of it, though).