Oof, okay, looks like it's my time to step up because I know this feeling. Putting this under a cut, it's long.
So, I dunno if y'all know, but if you don't - my big fandom (Homestuck, if anyone didn't check my name, yes this is my main) is currently in the middle of a situation...a lot like this one. We got an Epilogue that led into a sequel that, frankly, fucking sucked. It took the characters in shitty directions, clashed with canon information, was done by a team of fans with only some involvement from the OG author, clashed with the tone/intentional ambiguity of canon, was intentionally inflammatory, and a lot more - but that's besides the point. Naturally, it's tremendously unpopular, I can honestly say that the ratio of people I've interacted who disliked versus liked it all is easily five to one - I was formerly the one who did enjoy it, but the more I looked into it and the longer it continued, the less I liked it.
But, even though it was officially only "dubiously canon", it had an irrevocable and undeniable effect on the fandom as a whole - even on those who refused to read it. So, that kind of put me - and a ton of fans - in a similar position to you here. So, I don't know how good this advice will be - but these are things I know I or others around me did, and I can at least put them out there as options. Mind, most of these assume you'd rather not distance yourself from the whole thing.
1. Distance yourself from the plot point. Unfollow people and tags that talk about it, negative or positive - unless you'd like to keep at least some of these viewpoints in your feed. Ask friends not to talk about it, maybe avoid watching the future episodes or only watch them with the fact that they'll continue from that plot point well in mind. A simple break might help, and as A03COTD said, it can and will get easier with time - a new wound will usually hurt worse. If you still want to be part of the fandom, focus on the things prior to that plot point, at least for a bit - take yourself out of the thick of things with the one you really hate.
2. Fix its, as many as you want. I am aware of the fact that you said you wrote some, but frankly I doubt there can ever be enough fix fics. Looking at those of others can also help. Similarly, spite fics! Write specifically to spite and mock this plot point. Snidely point out how this would never happen. Laugh over how easy it is to avert - or write a fic about how hard it was to avoid, how close they came to going through that, and breathe a written sigh of relief. Diverge earlier, spin canon to your self-indulgent will and whimsy, replace it with plot points that you do want, twist it into something you enjoy. Parody it, even! Some spite, laughter, and self-indulgence can go a long way. Even just slamming out outlines or brainstorming ideas, simple and funny or complex and intricate, can be incredibly fun and cathartic. Even steal whatever you do like from that plot point, and run with it - taking a good part of a bad idea and making it better is also something that can be fun!
3. Consume other content. Focus on other fandoms you enjoy, or seek out a new one. Find something else to fill up your time and attention, to pull you away from this - whether it's until you feel ready to dive back in, or permanently. Fandoms and interests are hard to replace - but one thing you can do is find other things to enjoy. That could include, specifically, things that make you feel better in general - games or shows or similar that you like, nostalgic things, fun mindless things, all of those can take you out of a bad mood and might help, or at least soothe the hurt, on the scale going on here.
4. Vent about it a bit! Whether it's to the void of Tumblr in general, a space in your fandom where people might agree with or hear out your views, or your friends - whether they're in the same fandom or not - a bit of venting and talking about what's bothering you and why it's bothering you can help a lot. Even if the person or people you're talking to has or have little context for it, simply having someone listen and sympathize can take a weight off the shoulders.
I don't know how much or if any of this helps - but I really hope it does. I'm no expert, but I know this kind of stuff helped me and people around me through bullshit like this, so hopefully it does you some good too. ^_^
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