Yep. It's really fascinating. MS is much more common (and well-known) so even though the diagnostic criteria can get quite complex (because you have to eliminate any other potential case), it's a well-trodden path.
So it's great that with anti-NMDA there is an actual singular test to determine this, but given it's so rare and little-known, getting to that point is very much not given :-(.
What BurntSushi said regarding these things being very nonspecific is absolutely true here.
E.g. Multiple Sclerosis can very well fit what you're describing, too. Commonly, there's a flare-up (we commonly use the term "attack" funilly enough)of some neurological symptoms (numb limbs, tingliness, diziness, vision issues are very common) that can last a few days/weeks and then mostly or completely subsides (until the next time).
Absolutely not suggesting that's what it was, just that it is what it could be too (or many other things — auto-immune diseases in particular can be really broad and nasty).
Sushi, I'm so glad you're doing better. Some of what you said (including just writing about it for awareness and sharing) resonates with my MS experience. I'm sorry you've experienced this and I hope things will keep looking up! <3
So it's great that with anti-NMDA there is an actual singular test to determine this, but given it's so rare and little-known, getting to that point is very much not given :-(.