That’s unfortunate. I’m not sure what the situation is at your location, but here in Norway literally every type of work from cleaning shores, through industry and even CEOs, have their respective union. So there might be a relevant union for your workplace, still. Safety for the employees lies in numbers.
In the short term though, I’d recommend reaching out to a local/regional union-of-interest, like a “disabilities-in-the-workplace” watchdog organization.
Your boss&CO sound willing to infantilize you, if it becomes a case, so solid evidence of their conduct is important. though let’s hope your emails solved it, and makes them realize their wrongs.
Keep recordings of all work meetings the coming year
keep your phone in your pocket, make sure your phone mic is pointed in the right direction, and test sound quality beforehand. Garble is not useful for anything.
if possible, you should have a ‘panic’ button sequence on your phone, to hide/stop recording.
do not admit you have faults not caused by your condition, on tape!
You have the right to know who will be part of a meeting, and what the meeting is about, beforehand. They can still spring a meeting on you, if they don’t care.