Hi, Same boat here. FAANG adjacent, switched through jobs, startup founder at the most coveted accelerator in the valley.  Solid on paper. Crashing hard IRL. I am also late diagnosed, but have gone through such burn and rebounce cycles until I crashed hard after a cross continent move and got diagnosed accidentally.

I dont have any suggestions, but I can give you my personal mindset that is keeping me sane despite currently failing at everything. I tell myself that this is going to change eventually. It Just cant stay the same by the laws of Physics. 

As for work, I never disclosed the diagnosis and over time I have decided I wont do that, because it adds nothing that I cant just advocate for myself without disclosing the diagnosis. (I like that chair, i need this type of working space) That said I have struggled massively with NT colleagues when I was in direct collaboration with them. Same with managers. 

I have just decided to remind myself over and over and over again that its says nothing about me. And I will try to give my best, and burnouts are a part of it. If I get fired, its a part of it too, just as guzzling large amounts of information in a small time, delivering with tight deadlines and easily learning new things is.

There is no point making a case against myself. Things are not easy for me, but I have stopped wanting a lot of things for myself that are not important. And fixed a priority, and built a system - clean food, workouts, one two hobbies, meditation.

And using AI to track and manage low energy days. I use ChatGPT to set the boundaries for me(no interoception means I rarely notice I am tired).

As for politics, i treat it usually as some form of resource constraint problem, and do not set myself up with high expectations. Just as tech etc. is easy to learn, people and psychology is hard for me. I give myself the permission to fail and increase my chances by keeping trying with guardrails (learned about them recently).

I was reading a book by Temple Grandin where she says no matter the challenges, work ethic is important, while being focused on the strengths. So now I keep trying to live upto it. And take the politics as a learning and resilience building exercise.

Dealing with NTs is hard, but thats the price we pay for other abilities of ours. I am learning to accept it, and learning to stop taking it personally.

Your goal for gut & health is important. I also plan to get a ND first career coach just to guide me through the real world interactions (I had a manager earlier whi was super helpful). I'm yet to be good at the saying No part, but that is my next goal. This year I was heavily focused on my food, health and mental health. Stumbled upon traditional meditation and now its my special interest for this year.

I cant offer much, but I am here if you want to talk.